I was shopping for something else in one of our local crafty chain stores and saw this forlorn and forgotten package of burlap in the clearance section. It was already cut into 4 "prayer flag size' pieces but I don't think that was the original intent - nothing written on the package. Anyway I immediately jumped to that idea although I had never seen burlap flags or had made any myself. By the time my friend and I left the store I had sketched out in my mind a vague notion of how I would use them and couldn't wait to get started. It was a learning process from the beginning and I pretty much made it up as I went along.
One caution - when making prayer flags one should avoid stitching into the area at the top that is supposed to be left clear for hanging, lol.