Decorate roof. Use violet pouch icing and star tip to pipe zigzags on roof peak. Beginning at the top, pipe rows in this order: Stars with pink pouch icing and star tip, zigzags with orange pouch icing and round tip, line with yellow pouch icing and star tip, dots with green pouch icing and round tip, rosettes with violet pouch icing and star tip Repeat sequence until roof is covered.