How about large focus blocks, maybe 5 that overlap in the corners, and then use some for a f-5 inch border and the rest for a patchwork backing. I don't know why, but, I am seeing five 8 or 10" blocks framed with a very thin black border, that overlap as the medallion of a quilt and the rest of the quilt has pinwheel blocks in primary colours. I can see it in my mind (not sure why, because it has never happened before when looking at other peoples' fabric). Please let us know what you decide.