Through liberal use of StumbleUpon, I found the “When we play the game, it has this cover” thread on Story Games. The basic idea is for the participants to produce covers for the RPG books they use as though they advertise the way their group plays.
I was particularly amused by Graham’s entries for the Esoterrorists and Trail of Cthulhu.
If I were to do one, it would probably be for Dragonlance. A human cleric argues with a half-elven woman. A number of other people stand around looking bored, obviously waiting for the two to resolve their differences. Over it all, a dragon breathes fire that is about to engulf the group.