Picture of How to Make Plarn
How to make Plarn. Plastic Yarn.
Make from plastic shopping bags.
Then you can use it to create something like the purse that I crocheted out of Plarn, 

You will need:
*Plastic shopping bags

Step 1: Flatten out bag

Picture of flatten out bag
collect lots of plastic shopping bags. 
flatten out the bag by pulling at both ends.