Whisk Kid Rainbow Cake : took a while, but it was fun. It tasted good too. Made it for a birthday party and my friends were amazed. Frosting the cake all white definitely makes for a surprise when it's cut in to.
Teeny Tiny Rainbow boxes Better Crocker SuperMoist white cake mix, mixed up according to package directions 3 tubs white frosting parchment paper inch pans liquid food coloring (used colors from both the classic and neon sets)