Place coconut in large resealable plastic bag. Add food coloring; seal bag and shake vigorously until coconut is evenly colored.
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.
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.
Prepare and bake 2 pkg. (2-layer size each) cake mix, using 9-inch round baking pans. Use 3 of the layers for this cake. Reserve remaining layer for another use.
* Percent Daily Values are based on a 2,000 calorie diet.
Makes 18 servings.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.