Frosting a Christmas tree is a fun and festive way to add some extra sparkle to your holiday decor. You can start by purchasing a can of spray-on snow or making your own using cornstarch, white paint, and water. Apply the frosting mixture in a thin layer over the entire tree, making sure to cover all the branches and ornaments. Then, sprinkle on some glitter to create a sparkly finish. Finally, you can decorate your tree with lights and other holiday accents to complete the look.