This set of 35 grouping cards can be printed on cardstock, cut apart, and laminated to make a set of durable cards that can be used over and over again.
Each card has six images on it. Simply shuffle the cards and tell students to find the other people in the room who have the same colored circle (groups of 6), state (groups of 5), female historical figure (groups of 4), male historical figure (groups of 3), or animal (pairs). Then take up the cards and use them next time you need to quickly put kids in random groups!
I have personally used these in my 11th grade US History class, but they could be used in classes of any level or subject in which grouping is used.