Revising the present continuous today we did a picture dictation with a difference.
Half the class described a picture to their partners:

Then the listeners went and drew the picture on the board:

This activity was great fun, and a lot of language was produced, not only between pairs but also amongst the group drawing on the board, not to mention those sitting down who had the picture and called out “helpful” hints to the artists!

(The original image is from PairWork book 1, Penguin books 2002)