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.
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Useful shelf in shower. Walk-in showers (or wetrooms) are pure feel-good luxury. With a secure but seamless shower panel and tiles that extend the main bathroom floor into the shower, the overall feel is one of space and modernity.