How to: fuse plastic bags to make a fabric
This Etsy How-To: Fuse Plastic Bags! video leads you through the simple process of turning a pile of plastic bags into sturdier craftable fabric you can really get your needles into. If you're not up for watching a video you can find a written tutorial over on Casasugar.
What you make with it after that is entirely up to you. Let us know what you come up with, won't you?