Take back that space behind the door from the dust bunnies and put it to work. This looks a bit advanced for me (a klutz), but worth a try in the future.
#Space Saving Nightstands for Small Bedrooms ...
18 Space Saving Ideas Perfect for Any Small Home – Homes and Hues
Put a shelf above your bathroom door to store bulky items like towels. Very good idea for those horrible bathrooms with no closet or cabinets. It should be against the law to build a bathroom without storage!
Narrow Shelving makes great use of this tiny bathroom space See more space saving ideas: http://thegardeningcook.com/creative-use-of-space/
Pallet shoe organizer - but no directions...
Bookshelves - screwed to the wall, these are a great space-saving way to organize the kiddos' books. Jill Ruth & Co
i like these shallow, between stud, built in dressers for throughout the house. Great space saver.
Spacesaving garage shelving. I hung it in small manageable sections. I made about 30 feet of shelving up high for less than 100 buckaroos
These window shelves in Design Manifest's new cottage kitchen are easy to do and a great way to eke out some storage — 10 DIY Space Saving Projects To Make This Weekend