Editor's note: This recipe is reprinted with permission from Cakes for Kids, by Matthew Mead. You'll need to make two batches of this frosting to create Mead's Host of Ghosts .
This frosting is perishable, so make it the day you plan to serve the cake and refrigerate any leftovers after the party. The recipe makes enough frosting to cover the tops and sides of two 8-inch or 9-inch cake layers or one 10-inch tube cake, with some extra.