Thanks, everyone <3.
QuiltE, Bonnie releases a colour palette about a month before she starts dropping the clues. I mostly used stash fabric, but purchased some to comply with my understanding of that palette.
She writes about how she was inspired by the art and textiles in old Polish villages.
I actually didn’t have enough fabric to back the quilt, so I pieced a backing using a bunch of orphan blocks from this and other projects. So I suppose there’s even more history there!