Is something like the runnabout's lounge out of the question? They seemed to have made good use out of a small space.
That's a good direction to aim for -- something spare but clean and comfortable, with windows. When I think "break room" I think of something cruder. We want something that's compact in size, but psychologically inviting and soothing, maybe something with art on the walls as well as a viewscreen for watching movies or something. Maybe a fold-up treadmill or exercise bike comes out of a wall.