I would look for old flannel shirts at the thrift, I regularly see those colors at ours you can get a lot of squares out of a single mens shirts. Also look at the flannel pillow cases. My local store just had a bunch of really nice heavy duty flannel pillow cases which would allow you to get several colors and styles I buy them sometimes for rag quilts as they are soft and warm and so much better quality then most flannel you can buy. they run around 2-3 dollars at my area stores per king size pillow case.