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I've seen worse, at least in recipe form: some years ago I ran across a recipe for an absolute monstrosity of a polychrome cake that involved taking an ordinary cake-batter recipe and dividing into five bowls. Dye four of them red, yellow, green, and blue, and put a substantial quantity of melted chocolate into the fifth. Pour the five batters, by spoonfuls, into cake pans and bake as directed. Put the layers together with whipped cream between them -- which you've dyed purple -- and then frost with ordinary buttercream dyed with BLACK paste coloring to a dark "metallic looking" gray. Even the person who wrote it up described this as "an absolute Frankenstein of a cake".