RAINBOW CUP CAKES; All you need is your standard yellow or white cake mix. You can make it from scratch, or you can make it from a box. Mix up the cake batter, Divide the batter between different bowls. How many bowls is completely up to you - it just depends on how many different colors you want in your rainbow cupcakes. Squirt in enough food coloring in each bowl to give it a vibrant color, and stir well.In cupcake pan, spoon a dollop of each color inside the cups. Fill 2/3 way up. bake.