Animate walls with a lively swath of stone shingles. Stack is actually a mosaic product: 2-inch-square tiles are arrayed on 11-by-7-inch mesh-backed modules for easy installation. Individual tiles are carved into a wedge shape whose slanted top surface lends feature walls an exuberant tactility. The geometric running-bond patterning highlights the painterly veining and natural variegation of the stones, which include your choice of white onyx, green and brown marble, or silver, black, or copper-colored slate-all durable varieties capable of withstanding many antagonists. Sealing is recommended for most applications.