At a bathroom do you think of soft white and light instead of to a dark room. Black walls in the bathroom give a very different appearance than white tiles. A little daring, though. Dark bathrooms eyes chic, as if they belong in a hotel.
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With black-painted walls or black tiles give you a totally different look to the bathroom. White stands out on a dark background, white towels or a white sink give a nice contrast. But also if you all dark, it keeps very nicely. Perhaps less suitable for a small shower, but if you have a large bathroom its dark tiles definitely worth considering!