Make psychedelic cupcakes. I borrowed this idea from Betty Crocker: Divide white frosting among three bowls. Dye one blue, one yellow, one red. Alternating colours, dollop heaping teaspoonfuls into a piping bag fitted with a large starburst tip. Pipe frosting onto each cupcake in circles, starting at rim and working inwards. You can pipe psychedelic frosting on cakes, too. Even easier psychedelic frosting for lazier cake decorators, pg. 564 in 12,167 Kitchen and Cooking Secrets.