Create a mock-up screen of a first person perspective game. Just make sure it's clear that your perspective is from a first person viewpoint - so don't have your character stare directly at a wall!
Some examples are Dungeon Master, Waxworks and our own Stickman's Phantom Squad mock-up.
Canvas Size - Max 320 (width) x 200 (height).
Colours - Max 32.
Transparency - No.
Animation - No.