My guild did a fabric swap with charm squares (5", but you could pick any size). Each person who wanted to participate placed 10 charms in a baggie, and you could have up to 5 baggies. We turned the baggies in to the swap coordinator, who made a list with the person's name and how many baggies she put into the swap. Then the person drew a number from a bag. The baggies were laid out in no particular order, then the person with #1 would go pick out the same number of baggies as she had brought. She would take them over to the coordinator who would count them and verify the number was the same. Then each person would pick out baggies in numerical order. The only problem occurred when we found that someone had brought 20 charms, but put them in one baggie (some people just don't listen).