Here is an interesting idea from the folks at Meebo: Office Hack Day. I've done this before but they mix it up with non-tech related hacks too.
Devoting a day to a community based project has many benefits. It gives everyone a chance to break away from the monotony of everyday work and come together in a collaborative way. We spend a lot of time working individually so it is good to remember that a good part of our work is based on collaboration.
In the end, you get a refreshing new perspective on things, a little fun and relaxation, maybe learn something, plus you get to solve a problem or execute an idea that has been lingering around.
Here is the original bpost: