I use these slips to randomize the leader in discussions or in questions or any other group work. I cut the slips and the group chooses a slips each time a new question is brought up or for each new number on a questions worksheet. Based on the category, the indicated student will then lead the discussion or be the first to answer the questions.
Person who lives closest to school
Person with the longest hair
Person whose birthday was the most recent
Person who woke up the latest this morning
In all I have 26 category slips to randomize the participation in groups.