You could use the Elmo with almost anything in your lesson.
What exactly is your lesson on?
Do you have an article the students are reading, or anything from a text book?
Either of those would be something great to project with the Elmo in front of the class. I'm not sure how else you could use it, though, without knowing the exact topic of your lesson/what you need to cover.
Hope this got you at least thinking about what to do!
