Plant holders make great hair styling supply holders. Instead of hanging plants in them, you just mount them to the wall and put your blow dryer, curling iron and other hair supplies inside. They look great in the bathroom and help you to save a bit of cabinet space.
Heated towel racks are great alternatives to radiators in small bathrooms. They act as a heat source plus they're functional for storage. Not to mention their original purpose of keeping your towels warm.