is to skip the pattern and make them out of your old t shirts. It's easy-chop off the sleeves, cut the neck in a bit of a scoop, turn the shirt inside out and hem the bottom. (You can hem the neck if you want but the raw edge is considered just fine.) The scoop neck allows room to put the groceries inside and where the sleeves were cut off are now handles.
Use either your own old t shirts or pick some up at a rummage sale or thrift shop. I found one with a funeral home logo, which begged me to make something out of it. I have another written in Arabic (don't know what it says) but it screamed at me to buy it for a quarter and make it into a bag.
(You could do the same thing with an old tank top with no cutting.)
Here's a few links for you about t shirt bags:
http://www.instructables.com/id/FASTEST-RECYCLED-T-SHIRT-TOTE-BAG/
http://diyfashion.about.com/od/diybagsandpurses/ss/T-Shirt_Grocery.htm (this uses two shirts, has more cutting but makes a huge bag)
http://wildonionstudio.wordpress.com/2008/06/01/tee-bags-a-tutorial-to-recycle-a-tee-shirt-into-a-shopping-bag/
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