Gallery

http://www.visual-idioms.com/

Display several images representing idioms on the walls all over the classroom. Also attach some of the questions (from the posts or your own). Students walk around the room in pairs, look at the images and discuss the questions (as if they were in a gallery). When they finish, they sit down and try to recall as many questions as they remember, and take them down. They compare their answers with their partner first, then stand up and look at the original questions to find any mistakes. The questions don't have to be exactly the same as the original ones but they should make the same sense and they should be grammatically correct.