I personally love Stephen Wiltshire's panoramas, especially his one of Tokyo.
My suggestion for a competition is to draw a panorama of a region, whether it be a city, or a landscape.
It must be a full panorama, and be facing towards the horizon, and the tilt can be no greater than 15 degrees or so (how else could you do a panorama? )
This will bring on an interesting competition where our competitors would have to draw out their maps with depth from the side, rather than from a bird's eye view.
Poof. There goes all your useful talent in textures, brushes and mountains. You're going to have to manually draw out your map or paint it.
*evil smug grin*
-Corilliant