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.
Walk-in shower corner for a spot to place a shower seat. Adding a white seat to the gray-tiled base lets the bench show up against walls gray-tile walls. The white seat also ties the bench to the mosaic-tile niches and river-rock-tile floor.