(This might work for craft supplies as well) PEG BOARD SLIDES. Running out of wall space? Use peg board slides to store your tools vertically under the counter. These slides would work in kitchen base cabs.
10 DIY Bathroom Ideas That May Help You Improve Your Storage space shelf above the bathroom door. I actually plan to do this to make use of some extra space. I'll do it on both sides of the door-- the bedroom side will be a shelf for the cats to sit on.