This past year, we had the children of the employees draw up some art for the Christmas cards we sent out. The final product was professionally done and a bunch of our clients called us back to specifically mention that they enjoyed the cards.
One of the clients though, jokingly mentioned to a company partner that he didn't get his "cheesy pop-up calendar" this year. So in response to that, we conspired to create a special calendar for this lucky gent. I took a picture of two of the partners and then I pasted them onto some cardstock. We then placed these little pop-ups into a very cheesy 2007 calendar. (After I pasted them onto the cardstock and before they went into the calendar, I set up all the tiny people in front of my boss' door during her lunch break.)
The client loved it. I think this might be the start of a tradition.