Extra bathroom storage can be as simple as making use of open areas in artful ways. The windowsill and tub deck here offer narrow spaces for practical items, while slim wall stretches are great for hanging rods with baskets and shelves.
DIY: PVC Pipe Shoe Storage - so fun and so simple, could easily spray paint or cover in fabric or paper too. maybe a horizontal layout of two rows or something. I think this would be good for garage "yard shoes" storage