A few years ago I participated in a swap which covered all 4 seasons. A person could join for certain seasons or all and we signed up for each season when the group leader was taking names. We also had different partners at each swap.
Requirements were they were to be 8" square so that if all the participants wished to join their pieces together for a wall hanging or larger mat, they could do that. We were to just turn the foundation back and tack it down, no binding necessary.
Was a great day today, no snow and temps crept over the 50 degree mark.