I ran across this page and thought the ideas were terrific--not just for elementary teachers. Well worth the two minutes it will take you to read it. For example:
Are your students using Twitter? If so, infuse Twitter into the classroom by incorporating “tweets” into your exit ticket routine. Their ticket out the door is to “Tweet” or comment about a topic discussed in class.
This example is made from white paper strips which were laminated and written on with marker.