I have an informal set-up for games here.
A small group plays chess after school - I store the games for them.
On Wednesdays, a teacher chaperones a gaming club that hooks up to the old TV sets and they have a roudy time of it (I generally need to coach a little and secure the doors before I leave) and he is the designated chaperone.
I have Buddha Boards, zen sand gardens, banannagrams and origami here too. In the past I've worked with beginner knitters. I'm usually here working on the yearbook or another project after school, and these informal activities seem to fit well for now. It shifts with sports seasons, marching band, robotics and plays- very fluid.
I'd like to see more board games. I had a student helper who created a board game for me- the game of LIFE adapted for the college search. It was very well done- playing pieces, FAFSA, Scholarships, all kinds of realistic moves. It was a real hit.