Decorate cake. Using Christmas Red icing color, tint ¼ cup icing dark red, 1/4 cup icing medium red and 1/4 cup icing light red. Using Black icing color, tint 1/8 cup icing black.
Prepare two decorating bags with tip 3. Fill separately with light red and black icing. Using light red icing, pipe small “X” on front side of cake for mouth. Using black icing, pipe eyes and eye lashes. Reserve remaining light red icing for later step.
Insert ears into top of cake.
Prepare three decorating bags separately with tips 1M, 21 and 32. Alternate adding dark, medium and light red icings, as well as any remaining creamy white decorator icing, randomly into each bag.
Pipe rosettes and stars around base of bunny ears.