I'm good at leaving open cans sitting around anyway, now they'll grow pretties for me!
Did you ever make sunprints as a kid with that crazy probably super toxic blue paper? You lay something on top of it that you want a silhouette of and just leave it in the sun and you get something that looks almost exactly like this cake! This was done with food coloring in an airbrush gun and flowers as a stencil. Incredible effect, and you can eat it!