That's it. Little, yellow, different. No, we're not talking about Nuprin, we're talking about the IT Clip. It's just a bit of plastic that makes your discarded inner tubes into a tie down strap. They also make a model with hooks for bungee-style applications. Check them out at http://www.it-clips.com/
Apparently the only place to get them is McGuckin's Hardware store, the greatest hardware store on earth. Go to their website and click on 'Colorado Companies'.
Photo from http://www.it-clips.com/