Hi,
Once I joined a quite interesting game of using signs to describe movie titles. One person will think of a movie title and tries to describe it with signs, others will try to tell the title correctly.
There is another game using signs: guesssing the names of famous people. This may be a good game in classroom. One studdent is given the name of a famous person by the teacher. Then he will use sign to describe the person such as that's a man or woman, what job he/she doing, what characteristics he/she has, etc. The rest of the class can guess who the person is by writing his/her name on a piece of paper.
I am a teacher too, for 5 years for the hearing people and just recently for deaf people. I have tried these games to make them more interested in the lessons and to increase the contents of what they are learning.
Have fun.
Thi