If you're anything like us, you've got a full iTunes library and a shelf or closet full of CDs you don't use anymore. You could recycle them or try to sell them to some poor soul on Craigslist.
Or you could make them into something useful. What would you turn your old CDs into?
Danny Seo turned about 150 old CDs into a dumbbell, a shiny sort of retro dumbbell. It works as exercise equipment, a conversation starter, a paperweight, or even a piece of art.
We've seen CDs used as coasters ... What else?