I rented a locker at my local TechShop location so I can keep project materials and various personal tools conveniently located. The lockers are tall and narrow so everything accumulates in a pile at the bottom.
I whipped up a simple shelving system to organize the clutter using scraps for the shelves and some left overs long plywood pieces to support the shelves. I made this at the San Jose TechShop location. For more info on TechShop, see their website at: http://www.techshop.ws/