Recently our YM made their own pingpong table (we are in a VERY small branch, so not sure if this is something that automatically comes with a ward with a gym) But the kids had a blast playing it.
Also something they really love for combined (mutual) was Minute to Win It.. a minute to do certain tasks
(ex. pingpong balls thrown in trash cans, stacking ding dongs on forehead, putting uncooked spaghetti in your mouth and trying to thread it in pasta without your hands.. the most wins.. ect endless possibilities.) loads of fun, and fairly cheap, i think the most we spend on is for the prices (usually at the dollar store)
Once we met at a members house with a bunch of laptops and did family history work, made sure everyone had an account to get some of their family history done.
Just my 2 cents :)
