I have created a Mathematics version of Pictionary.
Encouraging mathematical language. To create the game cards I just printed off the slides (4 on a page) and then double sided them and laminated. They work great in class - especially for revision with Year 11s.
For more info on the game see my blog post http://mrcollinsreflectivejournal.blogspot.com/2011/12/mathematical-pictionary.html
I hope your classes enjoy.