Here are some ideas for organizing a small bathroom/washroom.
Hang spice racks to organize your hair products and lotions.
Speaking of small things, keep your bobby pins in check with magnets.
Hang two shower rods.
Put a book shelf above your door for extra storage.
Use a stacked plate rack to make extra counter storage space.
Install multiple towel rods on the back of your door.
Use wall mounted spice racks to keep stuff of the bathroom counter
Use a Wine Bottle Rack for Holding & Organizing towels.
Use shower caddies as shelving! They'll fit around the pipes & you don't have to hammer a single nail to install them!
Shelves inside cabinet doors
Dollar store containers velcroed to a drawer
How To Build A Corner Shelf (For a small bathroom.)
Hidden Toothbrush storage
Small bathroom organization
DIY Toilet Paper Holder From a Pot and a Dowel