Spread the cards out and look through them with the other members of your group.
Your task is to find a way to group the cards together which" belong together." You and your group will have to decide what it means to "belong together."
Make a label for each group of cards. Decide together what the labels should say. Your labels should make it clear which designs belong in each group so that another person could use just your labels to group the design cards.
When you have decided how to group the cards, make some sort of display to share with the whole group.
Each member of the group will be responsible for a short presentation of the group's solution to this task.