One of my favorite small space hacks is swapping your bookcases for wall-mounted…
Easy DIY wall box shelves for small bathroom.
How to install wall-mounted shelves, from This Old House
Awesome Open Shelving Books which You Should Make at Home - DecOMG
info on hanging track shelving.
Elfa: High, Medium, & Low: The Best Sources for Wall Mounted Shelving — Apartment Therapy's Annual Guide
This modular, wall-mounted shelving system looks great when being used, but also blends in seamlessly when not in use when you fold the shelves flat.