Decorate cakes. Use tip 2 and blue icing in cut decorating bag to outline eyes, teeth, nose, cheek and forehead markings. Use tip 3 and green icing in cut decorating bag to fill in teeth, nose and forehead (pat smooth with finger dipped in cornstarch). Use tip 5 and teal icing in cut decorating bag to pipe petals over eyes (pat smooth). Use tips 2 and 3 and blue, yellow and teal icing to pipe dot, scroll, outline and bead details. Use tip 3 dots of icing to attach roses to top of skull.