Spoon 1 heaping teaspoonful white frosting on center of each cupcake for bunny head. To make ears, cut each large marshmallow crosswise into 5 pieces with kitchen scissors. Using scissors, cut through center of each marshmallow piece to within 1/4 inch of edge. Separate to look like bunny ears; press 1 side of cut edges into colored sugar, flattening slightly. Arrange on each of the white icing mounds as shown. Use sugar, sprinkles and confetti to make eyes, nose and whiskers as shown. Store loosely covered.