Decorate Darth Vader cake. Ice inside helmet smooth. Use tip 3 to
outline and pipe in eyes, eye details and inside chin. Pat smooth
with finger dipped in cornstarch. Use tip 6 to pipe outlines on
mouth in black, overpipe with tip 6 outlines in light blue. Use tip 4
to pipe white helmet details and blue eyebrows. Follow pattern to
cover remainder of cake with tip 16 stars and tip 13 stars for tight
areas in colors shown. Position on round cake.