Decorate burgundy cake. Using Burgundy icing color, tint 2½ cups icing burgundy and 1½ cups icing light burgundy. Using 11 in. spatula and burgundy icing, ice cake smooth, adding spatula swirl on top of cake.
Prepare decorating bag with tip 81 and light burgundy icing. With rounded side of tip against cake, pipe shells around cake, starting at bottom and working towards top.
Helpful Hint: Once cake has crusted, gently pat down any icing from shells around top of cake.