Ice cake smooth and let icing crust before decorating. Cover work space with paper to catch any overspraying that might happen. Place cake in center of paper. Newspaper will work. Use paper towel wide enough to cover width of cake. Tear paper towel in half horizontally to create rough scallops. Place torn edge side of paper towel up, slightly below top edge of cake. Spray Color Mist? along torn edge.
Repeat process moving paper towel pattern down 1 1/2 in. each time, staggering pattern to create cloud movement until entire surface is covered with cloud effect.