There's only one rule: Any kind of block you want to do as long as it's 12x12 and uses two fabrics. One fabric can be any color or pattern. The other fabric must be white or white on white.
You would make as many blocks as there are participants, plus 1 for yourself. We would have a good amount of time to get it done, they would be mailed to be with appropriate shipping costs to send them back, and I would run the swap.
Is anyone interested?
(crossposted to swappies, quilting, patchworkblocks, fabric_exchange, afghans_quilts, sew_much_fabric)