Prime the walls and add the mesh and flex coat finish the micro cement put in the shower pan/floor clean. Web building a custom shower ledge (this post) upcoming: Web fairly new to make its appearance the shower ledge! Web a shower niche is a recessed shelf built into the shower wall. Walk in shower features gray herringbone wall tiles with white grout, an antique brass shower kit and a gray tiled shower niche. Most often the stone is 3/4 to 1 inch thick, although some larger stone comes in p...