I only do squares, small, medium and large.....take the large size, slice it in half width wise and add a seam....
or quarter and add a seam....IMHO anything else would be a waste of time as the raggy edges are the stars....
not the pattern.....if you do a little bit a thinking you can divide and divide which is what I do ....so I can use every little bit of my flannel....and remember IF you are going to rag quilt DO NOT PRE SHRINK....as that is all part of the charm.....do a test run.....