I have a bunch of old sweat pants that are getting holes in them and a bunch of old flannel shirts that I don't wear anymore, could I use these for a rag quilt? I thought about putting flannel on one side and the sweat pant material on the other. I also thought about alternating the blocks as well so that both sides would look the same but only have the rag seam on one side. All the sweat pants are different colors of grey but the shirts are all colors of plaid. What do you think?