We've often wondered if there were bed legs out there that simply attach to the box springs, eliminating the need for that metal frame that commonly comes with mattress sets. Turns out there are. Right here in San Francisco, they're strong, efficient, and they're green:
Universal Bedlegs attach directly to the wood frame of the box spring. They provide support to the middle of the bed, as you can add them at the centerpoint of the bed's span, not just at the corners. And they come in all different sizes depending on the height at which you want your bed: 3, 5, 7, or 10 inches.
Made of all recycled materials, the legs have been used in hotels for years and are available for individual purchase right here.