When I first saw these tiles, I thought to myself that this is what product manufacturers should pursue more aggressively: finding a use for waste materials. Bio-Luminum tiles are made from 100 percent high-quality aluminum alloy that is recycled from old airplane parts, so they are extremely green. But they contain a variety of alloys that make them strong and durable. The tiles are beveled on one side and have a straight edge on the other, which allows you to install them with a butt joint or with grout lines. Priced from about $60 per square foot, the tiles are available in three sizes: 6 inches by 12 inches, 3 inches by 6 inches, and 3 inches by 12 inches. www.coveringsetc.com.