Put a gallery wall in an unexpected place. Like over the tub in a bathroom in this photo from The Fashion Medley. In your laundry room. In your master closet. Why should the joy of a gallery wall only be for those who enter your common rooms?
tile mirror sink source: TerraCotta Properties Kids' bathroom features frameless mirror with wood shelf over Kohler Brockway Sink accented with his and her faucets over red step stools on white octagon tiled floor.