When examining modern bathroom design wall-hung furniture has to get a mention. White gloss will never go out of fashion but more recently furniture finishes such as wenge beech and maple have made a real emergence in popularity.
The key to decoration is neutral tones with a few dark colors. For the walls choose a matte or flat wall paint. Pale golds and yellows work particularly well as does floral or check patterned wallpaper.
This does take more work though because you have to change the setting for the insert to go into. Another great option though is to consider no vanity and just to have it mount to the wall. Such bathroom basins offer an appearance that makes the room open and to seem larger than it really is. However you do need to make sure you secure them correctly to the wall for safety.