Idioms Warmer

My warmers are usually connected with English idioms or proverbs. I give them to the students in the beginning of the lesson. They can be written at the blackboard.
Let's take idioms for example. It is possible to give the idioms which are united by one key-word. It is better to take 3 idioms. For instance (like banging a head against a brick wall, head in the clouds and old head on his young shoulders).
Then we discuss the idioms and their meanings with the students and I give them some time to compose their own stories and situations with one of the idioms.