Face paint and theater makeup can transform any costume into something spectacular, from the simple homemade ensemble to the elaborate store-bought getup. Don't have time to create a full costume? Pull together an all black outfit and paint a jack-o-lantern, a theater mask, or a mime visage on your child's face. Already have a costume but want to kick it up a notch? Search online or the library for face paint ideas that can polish off the look. Beware topping the costume off with decorative contact lenses, though. The U.S. Food and Drug Administration warns that contact lenses sold without a prescription are illegal and can be dangerous.