Used this as trim inside my shower with the marbled pencil trim. I used Carrara porcelain tile. Don't be afraid of mixing materials. This is carrara with ceramic subway tile. The pencil helps deal with the possible thickness differences.
This could work in a tiny bathroom. Love the tiled floor/painted wall combo and the fact that the tiles in the shower match the wall colour but are different from the floor. The niche for storage works well for us too.