Debbie Schwab Photography. The wall tiles are 12" x 12" black marble tiles I had the tile installers cut into threes. Stainless steel bars that were all custom cut are at the bottom and top of the tiles. Instead of having a standard niche that fits between studs, I had the guys frame out a wider one. Above it is another niche that is short just for housing soaps and razors. Next step is the glass.