I was given this image on a napkin from a friend wanting an Alien Cake to match. I created a stencil from the image and painstakingly cut out the black outline areas with an exacto knife and then laid the stencil on the cake.

I then dusted it with powdered sugar which leaves the image on the cake. Lastly, I piped in the buttercream frosting, starting inside the characters and working my way to the background.