Plastic Bag Bags

I suppose this is another example of "so Martha" and "such a hippie". I like to crochet purses from discarded plastic shopping bags. Reduce. Reuse. Recycle. I don't have a pattern for the purses. I really don't know how to crochet. I just make it up as I go along. (I need to learn how to paint like that) Here is the link that describes how to make a "ball of yarn." After that, you can work with it however you like?