Rainbow Cake

It’s a unicorn’s dream come true! Paint your palette with pure perfection in the form of a four-layered, fantastically flavoursome vanilla rainbow cake.

Layers upon layers of vibrant sponge are slathered with clouds of fluffy buttercream and scrummy white chocolate shavings. Don’t worry; your unsuspecting, vibrant-loving friend won’t suspect a thing; they’ll go about their party thinking you’ve got them a delicious yet seemingly BORING coloured cake (no offence to all our monochrome cakes, we still love you). They’ll be over the rainbow when they cut into this beauty and a spectrum of bright hues shine out! Along with a rainbow topper for decoration, this cake will leave your special someone feeling like they’ve stumbled across a pot of gold with a friend like you!

And fear not, whether you're nestled in Norfolk or lounging in Lands End, we've got your delivery covered with our express pigeon post. Just kidding – our couriers might not have wings, but they sure get to you quickly. 






  • Check mark Recyclable packaging
  • Check mark Secure outer box
  • Check mark Bio-degradable film
  • Check mark UK wide delivery available
  • Check mark Create the perfect gift with personalisation extras
  • Check mark Cutting guide included for the perfect portion size

Storage & Care

  • Check mark Allow the cake to come to room temperature before eating, the butter cream shouldn't be hard!
  • Check mark Once opened, store at room temperature in an air tight container.
  • Check mark Leftovers? Occasion not for a few days? Keep wrapped and store in the freezer for up to 6 months.
  • Check mark Use our included cutting guide for the generous portion size
  • Check mark Keep uncovered as it will dry out
  • Check mark Eat the cake straight out of the fridge or freezer - the cakes needs to be up to room temperature.
  • Check mark Leave cakes in direct sunlight as the butter icing may melt.
  • Check mark Leave unattended near kids, as the temptation will be too much!

Ingredients & allergens


Sugar, margarine (palm oil, rapeseed oil, salt, emulsifier E475, flavouring, sunflower oil, colours (curcumin, annatto), eggs, self raising flour (wheat flour, raising agents (sodium bicarbonate, mono calcium phosphate), calcium carbonate, iron, niacin, thiamin), butter (milk), white chocolate (sugar, cocoa butter, milk powder, emulsifier (soya lecithin), vanilla flavour), red, green, orange and blue colouring (E422 glycerol, E1520 Propylene glycol, E551, silicone dioxide, food colour E124, E129, E102, E133, E155, E171, E110) natural vanilla flavouring.

ALLERGENS IN BOLD. Made in a kitchen which handles eggs, nuts, milk, soya & sulphites.


  • The cake was really well presented and was exactly as shown in the pictures. My daughter thought i had home made it ... i was tempted to take the glory !
    Medium Rainbow Cake
    Kathleen R -
  • Really super service, fast delivery. Arrived exactly as described and tasted delicious, lasting a good few days. Will be back!
    Medium Rainbow Cake
    Christopher M -
  • Absolutely loved it perfect size for 10 people do soft and very tasty!
    Medium Rainbow Cake
    Sarah C -
  • Very moist - delicious - maybe a little sweet - you need a sweet tooth for this one
    Medium Rainbow Cake
    Nigel W -
  • Great cake great price well worth the money
    Medium Rainbow Cake
    Michelle K -
  • Would buy again! X
    Medium Rainbow Cake
    Caroline C -
  • Delicious
    Medium Rainbow Cake
    Egon M -
  • So happy I found this site I will definitely be ordering in the future!
    Medium Rainbow Cake
    Su-Yen F -
  • Brilliant cake, easy to order. Tasty, delicious, fresh!!!!
    Medium Rainbow Cake
    Lauren M -
  • Perfect for turning into a unicorn cake with a few accessories bought elsewhere
    Medium Rainbow Cake
    Joanne R -
  • Loved the rainbow cake for my daughters 10th birthday. Looked fab especially once you cut into it. Nicely finished and good for if you want to add any extra decorations yourself (which I did). My only negative would be that it was a bit too sweet, but that’s just me.
    Medium Rainbow Cake
    Julie J -
  • Tasted amazing especially the butter cream!
    Medium Rainbow Cake
    Jyoti F -
  • Lovely moist cake which was a hit with everyone
    Medium Rainbow Cake
    Angela J -
  • Lovely cake. Granddaughter loved it.
    Medium Rainbow Cake
    Lynne B -
  • Moist cake with limited butter cream pretty colours and covered in white milk chocolate with small chocolate shards .
    Medium Rainbow Cake
    Sandie H -
  • Loved it so moist and the children loved the surprise of seeing the rainbow cake inside great size went around whole class and teachers our go to cake for school when it’s the kids birthday
    Medium Rainbow Cake
    Sarah W -
  • Absolutely loved the cake and will order it again
    Medium Rainbow Cake
    Jenni Q -
  • My grandson chose this for his 6th birthday cake, it was well recieved and all his friends thought it was yummy 😋
    Medium Rainbow Cake
    Karen H -
  • Good option for an office environment - something for different taste buds
    Medium Rainbow Cake
    Steven S -
  • Delicious cake, moist and fluffy, light and airy
    Medium Rainbow Cake
    Shikiera K -

More information

Did you know?

Our Rainbow Cake is a multi-colour vanilla layer cake with deliciously sweet buttercream sandwiched between layers. It is also covered with a generous layer of vanilla buttercream and white chocolate flakes. If you're looking for a delicious rainbow cake to buy online‚ order one from Sponge!

These will make an excellent statement piece for any celebration and are particularly fun for birthdays. The generous size of the cake, with its multiple layers and thick buttercream and coating, means that the cake will easily serve more than 8! There are plenty of personalisation items to add to create an amazing party package too including cards, candles, balloons, drinks and more!

It's so easy to order our Rainbow cake online - just pop it in your basket, go to the checkout, pop in the delivery details, choose your rainbow cake delivery date and make your payment. Simple!

You can get one of our yummy Rainbow Birthday Cakes delivered anywhere in the UK! We deliver all over the country, including; London, Birmingham, Norwich, Manchester, Newcastle, Glasgow, Liverpool, Nottingham and Northern Ireland! You can even send one to a friend, loved one or family member; we deliver them straight to the door.

We know most of our cakes don't make it there but it's good to know you can freeze your Rainbow Sponge for up to 6 months! Either pop it in the freezer whole in its packaging (if you're saving it for a special occasion) or cut it into slices and put it in airtight containers. When you're ready for it, take it out of the freezer and leave it in a nice cosy spot for 24 hours to get it up to room temperature. Then you'll be able to enjoy your scrumptious cake.

STORAGE - Please store me in an air-tight container in a cosy spot - I don't like being kept in the fridge.