Gabion stone wall at Maleny House in Australia. Designed by Bark Design Architects. This could be great if you left space in the top for a planter or planted right into the sides with moss, air plants, or tiny hidden sculptures.
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.