How about ??
Each person writes on a piece of paper something the others do not know about her.
You put them on the wall.
The Challenge ... each person tries to match it to each other.
The one with the most matches wins!
(You may want to re-write them in your own handwriting, as with the small group, many will be able to identify the other person's writing.)
And you've each gone home, knowing something extra about your friends.