Nerf Dart Guns.
Closed offices is out.
OPEN is in. Plan a monthly fun trip, and involve the spouses. Loosen up the dress code for non-customer meeting employees. Appoint someone the Chief Morale Officer, responsible for telling you when you need a stress buster. If you have the gumption to get your team together, to breathe together, I would be very scared of your company if you were my competitor.