Metal Mosaic tiles are brushed 1- or 2-inch copper or stainless-steel squares. (Or try 1-inch copper penny tiles.) The dots, diamonds, cornices, and field tiles in the companion Pewter line are finished in gunmetal, antiqued bronze, aged brass, or darkened copper. 42 West 15th Street, New York, NY 10011; 212-255-4450; completetile.com.