At one retreat we divided up into teams and played a trivia game for strips and used the strips for the pineapple blossom blocks from Bonnie Hunter's website.
We've played bingo and quilto for small prizes. We did a dirty gift swap one time that was loads of fun. Everybody that wanted to participate brought a wrapped gift in the $10 to $15 dollar range. We all drew numbers and the first person started off by picking a gift but not opening it. Then the second person could either take that gift or get one off the table. There was no limit to the number of times a gift could be taken since none of them were opened until the very end.