Art students have a way with a wardrobe -- Day-Glo hair, clunky combat boots and some hardware store chains and they have pulled together a daytime look. But they really show their style when it comes to dressing for the Halloween season. The marble halls of the Maryland Institute College of Art echoed with screams and giggles for the school's annual costume ball Saturday night. Creative costumes were encouraged and sponsored by the school's Office of Student Activities and the student Performing Arts Committee, and they were a howl. It must be that ready art supplies and a knack for visual effects puts the art majors among the best in dressing up.