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.
tips for tiling a bathroom with marble tile, this bathroom has a great DIY vanity, reclaimed wood mirrors and is decorated with a few street finds, great combo of rustic and modern. I can actually see incorporating some if these elements into a nursery