When I saw the rainbow cake on the blogs, I knew I had to give it a try. It's actually 2 white cakes from mixes and you simply add various food colourings to make the rainbow. The only hard part is cleaning up the mess because it requires 6 bowls and 6 cake pans. I use the food colouring paste as it makes the colours more intense. The kids think its really fun when they cut into a giant white cake and find out it is a rainbow inside. I decorated around the outside of the cake with Skittles.
Make 2 white cake mixes as directed and separate into 6 bowls and tint.
Ice the cake with your favourite frosting. I used buttercream frosting and quite a bit of it. LOL.
And see the beautiful rainbow inside....