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Spoon frosting into decorating bag with large star tip (size #5). Arrange cupcakes in football shape using 15 of the 24 cupcakes. Pipe thick lines of frosting over football-cupcake shape. Using spatula, spread frosting over cupcakes. Pipe decorative border of chocolate frosting around edge of football. Sprinkle decorative boarder with M&M's™ chocolate candies. Pipe laces with white icing. Frost and decorate remaining cupcakes as desired, and serve alongside football. Store loosely covered.