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?
The exposed pipes, painted black, turn into a feature with this matching wash-basin for a great industrial-style bathroom. But if industrial is not your thing, make use of some wood elements, like the frame around the mirror to soften the look.