I make market bags from plastic store bags and colored trash bags. Here is a photo of a pink one I made. With most stores going with reusable bags now, I think people will enjoy these. I bought these bags at a dollar store for $1.00, 30 bags in a package, it used about 27 bags.
I am so sorry to you all, I had no idea there were responses to my bag until my friend came across it by accident and sent me the link to your comments! I used a pattern that was actually for a market bag made from cotton yarn. To make the strips I cut the handles off the plastic bags, then folded the bags up to about the size of a ruler and cut in about 1 to 1-1/2 inch strips, then looped the strips together and rolled up like a ball of yarn.
Again, I am so sorry for not replying to ya'll.
Crochet this green shopping bag using old recycled plastic bags. The plastic bags are cut into strips to create Plarn (plastic bag yarn.) I have the free pattern link here.
Link: http://www.myrecycledbags.com/2009/01/02/the-green-shopping-bag/