I built a 10' set of shelves made from recycled posts from my sister-in-law's patio she demolished, as well as pallets and remnants of plywood. The top, smallest shelf is from a local college's chemistry lab. They were redoing it, and these were just going to go to the garbage! They're perfect for our parts bins and such that just need a wee-bit of room and a slippery surface to be stored on.
I also painted it with mis-blended paint that I got on clearance from the home center. See my previous posts about my pool deck and my 1st shed posting.