In the world of Sloane Bibb, a license plate can become a goldfinch and a Chevrolet hood ornament can be a belt buckle. The Decatur, Ala., artist is known for taking found objects and advertising ephemera and converting them into three-dimensional art evoking both a sense of nostalgia and humor. A collection of Bibb’s work is on display now through Nov. 30 at the Piedmont College Mason-Scharfenstein Museum of Art.