While searching for some open shelving for my client’s powder room, I came upon this wall-mounted shelf from Pottery Barn. They suggest using it in a mud room or in a garage, but I loved the look of it for the bathroom. As the room is small, the open mesh gave it an airy feel, and I liked that it had a towel bar as well. I also liked the rustic finish, which complements our dark bronze light fixture and faucet.
Here are a couple of other bathroom shelving units that I like:

This one is nice if you’d like to have a little enclosed storage. I like the lift-up mirrored door.

This one’s a little more rustic, but could be very cute in the right spot.
Do you have a creative idea for storage in the bath without a lot of built-in cabinetry?