This exercise can be used as a warm-up speaking activity for an intermediate level. If the class size is small, this activity can be used as the whole class activity. Give a card to each student and let them think of how to describe the object in the picture . When everyone is ready for the activity, ask each of them to describe the picture to the class and let the rest of the class to guess the word. I find this activity very engaging and help my students more fluent in communication.