We're in the same situation, our basement isn't finished yet (Tothburg) and trying to think of future ideas. I was playing with a design program trying to think of some good rooms. I wanted a pool table, bar, TV/Media Room, and Gym/exercise room. Not sure how to lay it out though. There are some annying support columns and plumbing pipes in the way in some spots (tried to work them in the image below). Plus you need access to the Furnace, electric panel, etc. Plus I still need some small space for storage.
Below is a link to how I'd LIKE our basement to look. But couldn't get that layout to fit exactly the same way in the tothburg basement, so the above image takes some liberities in the layout but is trying to do something similar to the below link.
http://www.hawthornevillager.com/phpbb/ ... php?t=8965