During my time in sociomantic / dunnhumby there was a tradition of designers making personalised posters and cards for the people leaving the company. It would usually be made of any stock vectors lying around and (loosely) follow the current corporate identity.
Card for Koko, head of Creative Services and red Power Ranger
Card for Phil, the saviour of our networks, knower of all passwords
Card for David the human, recruiter and boss of Oggy the dog
Card for Oggy, the internationally known tech company dog
Card for Mac, the office "kicker" champion