While you may have heard the myth ‘don’t use small tiles for small bathrooms, that isn’t necessarily the case. While using them throughout the entire room may make it look busy, using small tiles (such as mosaics) sparingly can all a touch of style and elegance to the space.
You should, however, concentrate on light tiles. White tiles are the most common tyles for bathrooms because they radiate light and make a space appear larger than it really is, which is essential for small bathrooms. This isn’t to say you should only use white tiles. Like with small tiles, you can add dark tiles to a small bathroom, but it shouldn’t be the primary tile choice; use them in contrast with light/white tiles.