I think that play can be incorporated into even the most mundane workplace through the relationships of the people within that workplace. A matter of attitude I suppose.
Life is life; you might as well enjoy it regardless of what you are doing --- working or playing. Sometimes there probably is not a convenient line between the two.
I enjoy work tremendously and find that my non-work activities are breaks from it, to rest my mind so that I can plow into it again the next day. I'm on the live-to-work side because work is very satisfying to me.