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Cake Toppers

How to make a rainbow cake topper

Jazz up a simple cake and add an element of fun with this rainbow cake topper tutorial. It’s easy, colourful and suitable for all levels of cake decorators. 

How to make a rainbow cake topper - by Love Cake Create

My buddy Cherrie asked if I’d like to make a rainbow cake topper for her little girl Ashley’s 3rd birthday cake. Since Ashley is a big fan of My Little Pony, she was making a pink cake and would top it with the rainbow cake topper and a My Little Pony toy. The plan was to pop over to her place and help make the buttercream icing and decorate the cake. I don’t get the opportunity to make pretty pink cakes very often, so I jumped at the chance to help!

I’m a massive fan of 2D cake toppers that stand up (check out my ruffle heart cake topper tutorial here) because they really help a cake ‘pop’. Rather than having a cake topper that lies flat on top of a cake, I think these add so much more visual impact. This is such a fun and colourful cake topper so we want to show it off to its full advantage!

This topper will need a couple of days to dry, so give yourself some time to plan ahead. My collection of gel colours is a mish mash of different brands so feel free to use the colours you have on hand. If you’ve got a fondant extruder, you can use that to create the rainbow if you like.

I used a 6cm circle cutter to mould the rainbow and the finished rainbow just fit on a 5″ round cake. If you’re making a smaller cake, or if you have other decorations to go on the cake (like buttercream swirls for example), use a smaller cutter to give you more room around the rainbow.

For this rainbow cake topper, you will need:

Pink fondant (I used Wilton Rose – next time I would use Americolor Electric Pink)
Purple fondant (I used Americolor Electric Purple)
Blue fondant (I used Wilton Sky Blue)
Green Fondant (I used Americolor Mint Green)
Orange Fondant (I used Americolor Orange)
Yellow Fondant (for the starts I used Americolor Lemon Yellow)
Fondant smoother
4 x toothpicks
Tylose
Sugar Glue
Circle Cutter (6cm)
Star Plungers – Small and Medium
Sharp knife
Dresden Tool
Optional – to personalise the rainbow with a name/age
White fondant
FMM Block Letter Tappits
Pin
Rolling Pin
Cornflour
Paintbrush


Rainbow cake topper tutorial


Let’s get started!

Work out the order of the colours for your rainbow. I decided on pink at the top, then purple, blue, orange and green.

We’ll start with the green first. Push your ball of green fondant into the tylose/CMC powder. Mix in the powder that sticks to the fondant. Create a long sausage of fondant and use the fondant smoother to roll over the sausage which will ensure it’s even and smooth. 

How to make a rainbow cake topper - by Love Cake Create

Mould the green sausage around the circle cutter. Make sure it’s a snug fit around the cutter. Trim off each end of the rainbow – mine is about half way around the circle.

How to make a rainbow cake topper - by Love Cake Create

Repeat the above process with the orange fondant – this time though add a thin layer of sugar glue around the top of the green fondant and then mould the orange fondant over the top. That will ensure the two rainbow layers stick together. For the green and orange layers of the rainbow, we’re not going to curl up the ends – that will begin with the next colour.

How to make a rainbow cake topper - by Love Cake Create

Next take the blue fondant and mix in the tylose/cmc powder. Create a long sausage on fondant, give it a going over with the smoother and taper one end so it comes to a bit of a point. Brush some sugar glue along the top of the orange fondant and mould the blue fondant over the top. With the tapered, pointy end, start to coil it up so it creates a swirl.

TIP!

If you find the fondant starts to crack when you’re making the swirl, you can add a little vegetable shortening (like Crisco) to soften it or add in a tiny bit of fresh fondant (with no added tylose/cmc powder).

How to make a rainbow cake topper - by Love Cake Create

Repeat the above process with the purple fondant, creating the swirl above the blue fondant and securing in place with sugar glue.

How to make a rainbow cake topper - by Love Cake Create

Repeat again with the last colour, pink.

How to make a rainbow cake topper - by Love Cake Create

To make the rainbow stand up on the cake, we’ll insert a couple of toothpicks in the bottom – these toothpicks will go directly into the cake.
 
Gently place your fingers over the left side of the rainbow. Your fingers will hold it all in place while you’re inserting the toothpick. Take the toothpick and dip the end into the sugar glue. Insert that end into the orange fondant – or whatever colour you have in that position – approximately half way up the toothpick. Repeat with the right side of the rainbow. Now your rainbow should look something like this….

How to make a rainbow cake topper - by Love Cake Create

I removed the circle cutter while the topper was drying – that way air could get to the green layer. Once you feel like the front is totally dry, you can gently flip it over so the back completely dries too.

To make the clouds

Take some white fondant and push it into the tylose/cmc powder. Mix in the powder that sticks to it. Roll it into a sausage and taper both ends into a point.

How to make a rainbow cake topper - by Love Cake Create

Take one end and start to coil it around a little. Take the other end and coil it around in the opposite direction (as shown below).

How to make a rainbow cake topper - by Love Cake Create

Use the Dresden tool to make a couple of lines along the clouds which indicate the wind.

How to make a rainbow cake topper - by Love Cake Create

Repeat the above process to create a second cloud. Stand the clouds upright and gently push them into your work surface a little – this will help make the base of the cloud flat and stand up better on the cake. You can also insert a toothpick into the bottom of each cloud which will help secure it to the cake. Pop them aside to dry.

Once the rainbow has had a chance to dry for a couple of days, it should stand up like this when inserted into the cake…

How to make a rainbow cake topper - by Love Cake Create
For such a plain and simple cake, that topper is really effective in making the cake stand out!

To add some stars and personalise the rainbow with a name and age…

First add some tylose/cmc powder to the yellow fondant and mix it in well. Use the Star plungers to create one medium sized star and a few smaller stars. Pop them aside to dry.

For the name and age I used the FMM Block Letter Tappits – they’re my favourite! You can of course use any letter cutters you have available. Although these are my favourite letter cutters, we have a bit of a love/hate relationship and a few cranky words have been spoken when trying to get these little suckers out. If you’ve used these before, I’m sure you can relate!

Add some tylose/cmc powder to the white fondant and mix it in well. Roll the fondant out into a long sausage and use the rolling pin to roll it super thin. If it’s too thick, it will make getting out of the letter mould more difficult. Leave the fondant strip to dry for about 15 minutes – you can flip it over so the back dries too.

Once dry, take the paintbrush and coat the inside of the letter with cornflour. Place the letter over the strip, push it down firmly and wiggle it about so the letter cuts through the fondant.

How to make a rainbow cake topper - by Love Cake Create

Flip it over and run your finger over the letter to remove any straggly bits of fondant. Now this is the fun (or not so fun!) part! If you give the tappits a good whack on the table, you might be able to remove the letters easily. If not, use the pin to gently remove the letter.

TIP!

If the letter is falling apart and not coming out cleanly with the pin, leave the fondant strip to dry a little longer or place the letter cutters in the freezer for 10 mins to firm up the fondant.

Cut out all the appropriate letters for the name and age.

How to make a rainbow cake topper - by Love Cake Create

To attach the name, age and stars, I found it easier to lie the rainbow down flat on the work surface and arrange them in position on the rainbow. That way I could work out their placement before securing them with sugar glue. When you’re happy with the position of the stars, name and age, brush a little sugar glue on the back of each one and gently adhere it to the rainbow. I
nsert the rainbow on top of the cake and arrange the clouds in front.

You should now be looking at a rainbow that looks similar to this….
 


For such an easy topper, it really packs a visual punch!
 
I hope you found it easy to follow along and if you’ve made a rainbow topper using this tutorial, I’d love to see it!

If you enjoyed this fondant rainbow cake topper tutorial, don’t forget to PIN it!

How to make a rainbow cake topper - by Love Cake Create

Keep on reading

  • How to make a Lips and Lashes cakeHow to make a Lips and Lashes cake
  • Dark Chocolate Mud Cake RecipeDark Chocolate Mud Cake Recipe
  • The Best Vanilla Buttercream FrostingThe Best Vanilla Buttercream Frosting
  • How to make an ice cream cone cake topperHow to make an ice cream cone cake topper


24 Comments

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Comments

  1. Belle says

    April 18, 2018 at 3:27 am

    Oh my gosh! That DIY rainbow cake topper is the cutest! I love how simple it is to make!

    Belle | http://www.OneAwesomeMomma.com

    Reply
    • Caroline says

      April 18, 2018 at 7:54 am

      I’m glad you think so Belle, thank you! It really is an easy topper to make and perfect for so many themes 🙂

      Reply
  2. Kim @ Berly's Kitchen says

    April 18, 2018 at 9:30 am

    This is so adorable and really, really cute! Perfect for a little girl’s birthday cake. It doesn’t look like you’d need to be too crafty either.

    Reply
    • Caroline says

      April 18, 2018 at 12:37 pm

      Thanks for your kind feedback Kim!!

      Reply
  3. Sandy says

    April 18, 2018 at 9:31 am

    Love this cake topper! The rainbow is so adorable and the directions are so easy to follow. I’m not much of a cake decorator but I think I will attempt this one!

    Reply
    • Caroline says

      April 18, 2018 at 12:38 pm

      Thanks Sandy, I’m happy to hear that you found it easy to follow and will attempt one yourself!

      Reply
  4. Amanda says

    April 18, 2018 at 12:08 pm

    Oh my goodness that rainbow cake topper is too cute. I have never tried to make anything with fondant, but you make it look so easy that now I am empowered!

    Reply
    • Caroline says

      April 18, 2018 at 12:39 pm

      Yay, that makes me so happy Amanda! It really is a simple topper and much easier to make than it looks!

      Reply
  5. Megan Rowsey says

    April 18, 2018 at 1:53 pm

    You are a queen! This is amazing! I love a good rainbow and unicorn party!

    Reply
    • Caroline says

      April 18, 2018 at 8:31 pm

      Thank you Megan!! I love those two themes too!

      Reply
  6. Taylor says

    May 6, 2018 at 2:17 am

    This looks really cool! Thanks for sharing 🙂

    Reply
    • Caroline says

      May 7, 2018 at 1:45 pm

      Thanks Taylor, this was a fun and easy to make 🙂

      Reply
  7. Louise says

    May 12, 2018 at 8:41 pm

    This really is easy! And beautiful! Thanks for this tutorial. I’m saving it to try it later.

    Reply
    • Caroline says

      May 12, 2018 at 10:00 pm

      Thank you Louise, I’m so glad you like it! It’s an easy topper and helps add a touch of fun and colour to a cake 🙂

      Reply
  8. Kim Seghers says

    May 15, 2018 at 9:24 am

    Your rainbow cake topper is adorable. I love your tutorial you make it look super easy to duplicate.

    Reply
    • Caroline says

      May 26, 2018 at 10:23 am

      I appreciate that Kim, thank you! Pleased that you found it easy to follow along 🙂

      Reply
  9. Karin says

    May 15, 2018 at 3:20 pm

    This is so cute!!!! I’m not sure I’m creative or patient enough but I’d pay someone to make it?! Lol

    Reply
    • Caroline says

      May 26, 2018 at 10:22 am

      Thanks Karin, it’s much easier than it looks!

      Reply
  10. Alyssa Dawson says

    May 15, 2018 at 3:32 pm

    Oh man! This is really cute and so clever! Great tips and ideas!

    Reply
    • Caroline says

      May 26, 2018 at 10:21 am

      Thanks so much Alyssa, so glad you found it helpful!

      Reply
  11. Sheila Schweiger-Rhodes says

    May 15, 2018 at 10:56 pm

    This is adorable! My daughter and I have started taking some cake/cupcake decorating classes and are enjoying learning all the different techniques. I’m looking forward to working with fondant. Your cakes are beautiful and so detailed. Thanks for sharing!

    Reply
    • Caroline says

      May 26, 2018 at 10:20 am

      That’s so lovely that you and your daughter are taking cake decorating classes together Sheila! It’s such a fun hobby to explore. I’m so pleased you like my cakes and tutorials, I hope they come in handy in the future!

      Reply
  12. Jereann says

    May 16, 2018 at 2:10 am

    That is the most adorable and beautiful cake topper ever! My daughter’s birthday is coming up next month and she would LOVE this!! I’ll have to start practicing.

    Reply
    • Caroline says

      May 26, 2018 at 10:16 am

      Thank you for your kind words Jereann! Best of luck with your daughter’s cake, I’m sure it will be wonderful!

      Reply

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Hello and welcome!

I'm Caroline, owner and cake designer at Love Cake Create. I'm also a mum of two sweet boys and wife to an amazing hubby. This creative blog is filled with cake tutorials, fun and delicious recipes with a good sprinkling of inspiration for your next celebration. If you love baking and decorating, you've come to the right place! Read More…

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