I used to do a lot of these. After your cake is baked and cooled, outline every part of the cake that is indented. Then you start to fill in with the starts and the appropriate colors. After you are all done filling in with stars, outline again to define the areas. Also, I always outlined with black frosting. It was sort of line coloring from a coloring book, where all the pictures are outlined in black. Hope that helps!
9/11/11 at 11:36pm