Cobble Cobble: The handmade products of the Cobblestone Series are made by dropping molten glass onto a flat metal surface. The color is then fired into the underside. Available in white or variegated gray, the tiles are mesh-mounted, feature 30 percent post-consumer waste glass, and come in a polished or tumbled finish. Hakatai Enterprises. 888-667-2429. www.hakatai.com.