I've been working on a crocheted plastic bag tote, made from recycled kitty litter bags, for over a year now. I started it on Earth Day 2008. I remember because one of my sisters called me to see if I had the lights out, and I was watching Mel Gibson in "What Do Women Want?" So no, I did not have the lights out.
But the bag is green, literally and figuratively:
The plastic is much thicker and sturdier than regular grocery store bags, so I've had to use it "one ply" and cut the bag into one huge, 1/4" thick spiral. The only other con to it is that the material is so thick it isn't exactly soft and fuzzy when it connects against skin. Great color, though!