Ahh... plarn. I've started making that, too. If you do a search for 'plarn,' you'll find several sites, some that include videos. The best way I can explain it is this: flatten your bags, then fold them over lengthwise. Cut off the handles and the bottom of the bag (assuming it's glued at the bottom), then cut the rest of the bag into strips by cutting across. I usually cut them about 3/4"-1" wide. Connect each loop by using the square-knot technique and ball it up however you like. I'm getting ready to make some more myself; I've also started collecting bread bags (including bagel bags, english muffin bags, etc) to use those, as well.