A tiled bath panel.
Bath Screens - Shower Enclosures - Shop by type - Bathrooms | Fired Earth Grey Subway Tiles
Larger grey bathroom image
Bathroom Tile Ideas....live this minus wouldn't want the toilet right next to the tub
Gray bathroom 'Perfect sanctuary' using Smoke Grey 3x6 glass tile in the modern shower. https://www.subwaytileoutlet.com/products/Smoke-Glass-Subway-Tile.html#.VNPu7EfF-1U