These can turn in to a huge nightmare. Different sizes, people not leaving the 1/4" seam allowances and not turning them in in time so you have to drive around and pick them up OR you have to make up enough blocks on your own to make a nice size quilt. I would seriously rethink this idea and make sure you are willing to put in a lot of extra work to get it done. Maybe others on the board have some other suggestions you can consider.