Cut, bake and cool mitten cookies. Use tip 3 and red royal icing to outline cookie. Use tip 3 and red royal icing thinned with water to flow in and cover mitten; let set. Use tip 3 and yellow royal icing to pipe zigzag on mittens. Use tip 2 and green royal icing to pipe dots on mitten between zigzags. Use tip 16 and white royal icing to pipe zigzag fur cuff.