Decorate cake. Prepare white and chocolate buttercream icings following recipe directions. Tint a portion of white buttercream golden yellow/lemon yellow combination (for yellow). Tint chocolate buttercream black.
Use spatula and white buttercream to Use spatula to ice sides smooth . Use tip 3 and black buttercream to outline cap. Use tip 16 to fill in cap with stars.
Use tip 8 and yellow buttercream to pipe rope. Use tip 5 to pipe tassel strings. Use tip 8 to pipe knot. Use tip 12 and black buttercream to pipe dot button; use finger dipped in cornstarch to flatten to an oval, 1 in. x 3/4 in.