Last month my youngest son turned 2 years old. I made him a Rainbow Fish Birthday cake, like the storybook. Inside it was Chocolate Zucchini Cake with Vanilla Buttercream. Smarties as scales, coloured sugar and gummi fish. I was so lucky to find the gummi fish at the shops and they turned out just perfect for the cupcakes. I tinted some of the buttercream blue on the cupcakes to make it look like the fish were in foamy waves.