Are you allowed to customize your workscreen? Just interested as to what people would put up. I use Paint and made up thus:

Mitchell and Webb as "Sir Digby Chicken Caeser and his ward".
Tre Cool "giving it some stick".
Emperor Palpatine and Anakin Skywalker looking menacing with lit lightsabres.
Johnny Depp as Ed Wood, pitching an idea.
Meg White singing into a microphone with Jack playing guitar in the background.

anyone else, or are all your bosses bastard killjoys?