Over the door storage for a small Bath with limited space and no linen closet. To maximize space in the bath add a shelf over the door to store extras like toilet paper and extra towels. What a difference such a small change can make!
Use any glass jars (from store bought sauces, pickles, olive jars, jams, even baby food jars as long as it has a twist on lid) to store things under shelves or cupboard! From herbs & spices & sugar in the house to nails & bolts in the garage.
Kitchen Organising Ideas ~ 55 Genius Storage Inventions That Will Simplify Your Life -- A ton of awesome organization ideas for the home (car too! A lot of these are really clever storage solutions for small spaces.
Use Ikea Knuff magazine files as under sink storage holders. Screw a magazine file holder to the inside of kitchen cupboards. Add space to store more bulky items like chopping boards, cleaning products etc.
In the bathroom: Trones boxes fit into tight corners to provide a little extra storage. These little guys can go pretty much anywhere. How To Use IKEA Trones Storage Boxes in Every Room of the House — From the Archives: Greatest Hits