Recycled cardboard is becoming a favorite material for innovative sustainable design. The minimal, retro-looking Cardboard Radio from Suck UK and designer Christopher McNicholl is a case in point. It features an MP3 jack so you can listen to your iPod on the go. And when you’re finally ready to get rid of the radio, just remove the simple card structure that houses the electronic parts, and throw it in the recycling bin. We can't vouch for its sound quality, but judging from this video, it seems to work pretty well. Just don't get it wet!