I was in a group where we had a big stack of empty pizza boxes. Everyone would take an empty box and put a pattern in it along with the fabric they wanted used. Put their name on the box. Then we would stack them back up and when we got ready to leave we would pick up a box ( not knowing what was in it, no peeking) then bring it back with the block made inside and stack them up again. Then when we got ready to leave, take a different box. We did this once a month and by the end of the year everyone had enough blocks to make a quilt.