This is Winter Holiday Party Password. It's ready to play, with one simple page of instructions included right on the slides. The kids understand it quickly.
Two students sit with their back to the screen. The 'password' is displayed to the whole class, sight unseen to the contestants. The class takes turns, in two teams, providing one-word clues. It's synonym practice and a lot of fun at the same time!
You can see an example of how to play (don't show this to students) at: http://www.youtube.com/watch?v=hERzvxp5ab0
You can spend 10 minutes on this or 45 minutes, or anything in between. You can easily skip some if they are too hard or too easy. It's editable so you can add your own also.