update: So I pulled out the fabric to cut the log cabins, and somehow it became over 400 4.5" squares for half-square triangles. As I was cutting, I accidentally(at first) lay them out by value. Then it was a tiny leap to a stack of darks and a stack of lights.
The lights marked in half and stacked:
The darks shuffled in the Halloween candy bowl.
The first five cut and ironed, because I had never made a half square triangle before: