Mount an inexpensive shower caddy to the wall to stash office supplies, bills or mail. More home office storage on a dime: http://www.bhg.com/rooms/home-office/storage/cheap-home-office-storage-ideas/?socsrc=bhgpin061413showercaddy=17
if you have deep shelves, and narrow items, add a second shelf.... here they used two low candle holders and a plank (super glued together)... you could also use a thick phone book, or several layers of cardboard. Now you can see both layers!
Glue some clothespins or use screw hooks on a strip of wood for a creative way to organize belts and necklaces. You could also use the clothes pins to hang a small box or basket for chunky bracelets or other items that wont fit the clothespins.
37 Insanely Smart DIY Storage Ideas You Need To Know