Milk Jug Skeleton. Video showing how to make skulls. When finished, paint with glow paint and you have inexpensive glowing skulls. If placing on a wall, you probably don't need the back of the skull and if careful, can get 2 skulls per jug.A 7-ounce can of Rust-Oleum Glow-in-the-Dark Brush-on Paint is 7.79 at most stores.