Ice 2-layer cake smooth. With decorating triangle, mark wavy effect on cake sides. With toothpick, dot mark cake into 10 sections, ever 3 inches and 1 inch from the top edge around sides. Pipe tip 10 vertical poles over marks. Pipe tip 21 zigzag bands over the cake top and sides. Edge cake base with tip 21 rosettes border trimmed with tip 16 stars.