The guys and gals at Last FM built a ball pit in their office. From looking at photographs taken of the installation, it wasn’t like they had a giant open space in their headquarters screaming for a ball pit. They simply read about someone else who made a ball pit, were inspired by the idea, and, 19 hours later, had it done.
So. . . I don’t know. . . it’s just a thought. Let’s say you have this section of your office that isn’t being used. Preferably it’s in the shape of a square or a rectangle. Oh yeah, it needs to be enclosed by walls. . .