I made a Flash cake - a round cake, iced white. Then with a square cake, I cut two jagged pieces to look like the top and bottom of a lightening bolt. I set them up against the circle cake, at the top and bottom, they were also iced white. I used yellow sprinkles to color the lightening bolt yellow. I made a lighting bolt on a piece of paper and cut it in half, to create a stencil. The paper covered up the edges of the round cake, so I could make the lightening bolt with yellow sprinkles through the center of the cake. I outlined the bolt in black gel-type icing.