Do you use FaceBook? A group there, Scrap Quilt Enthusiasts, featured many of these a couple of years ago. Lorraine Mooney posted one, someone asked how it was done, and it took off. She ended up writing some basic directions with various size blocks and many put their own spin on it.
I am trying to link an album that has just a few of the ones that were done. Not sure if non members can see it?
https://www.facebook.com/media/set/?...4482500&type=3
I've sent her a message to ask if I may share her written instructions with this group, as I know many do not use FB. Will follow up when I hear back.