TINT coconut with green food coloring.
LEAVE one cake layer whole; cut remaining two cake layers as shown in diagram. (See Shamrock Cake Diagram Tip linked below.) Arrange cake pieces on serving tray as shown in same diagram, using small amount of the whipped topping to hold pieces together.
FROST cake with remaining whipped topping. Sprinkle with coconut.
FLATTEN gumdrops with rolling pin; cut into shamrock shapes with sharp knife or small cookie cutter. Outline edges with decorating gel; arrange on cake. Use decorating icing to outline cake. Store in refrigerator.
Size It Up: Three cake layers are used to create this over-sized cake which makes 18 servings. Prepare this easy and fun cake with your kids to make any St. Patrick's Day celebration seem more special.