I love to recycle anything I can, especially if I would have to pay to throw it out. Last year we replaced our cheap box spring and when I took the fabric off, it had a lovely wooden framework! I reworked it by cutting it in half, taking the middle boards out and adding them to the side to create a lattice box. It was about a foot deep, and perfect for growing my lettuce in last year. Added bonus, it looked great, no one could tell it was a box spring in its former life.