15th Dartmouth Brownies
(good with people who know a bit about each other already)
Each person is told ahead of time to bring ten objects with some meaning to them to whatever event you are doing this at. When they arrive, give them a bag with a number on it and get them to carefully place their objects into it. Then make sure each person gets someone elses bag. They have ten minutes to write down ideas about what the person who owns the objects is like, and to try to guess who they are. It is best if you don't do the guessing until after everyone has had their say. This would also work as an end of camp game, to see what people have learned about each other.