I saw a video about ten years ago on crocheting with plarn (plastic bag yarn) and I thought it was such a neat idea. There was just one problem: I didn't know how to crochet. So, I started hoarding all my plastic bags (even more than I already was) thinking, "Oh, I'll learn how to crochet one day!" I finally learned to crochet a few weeks ago and now I'm working my way through my massive bag stash. I left the tail ends on and tried to tie them into decorations so I wouldn't waste any of the plastic.
I am way too excited about my trash bag bag. :)
They can make a pretty decent string/rope to tie stuff off too!