Ok, just knocked out 4 thumbnails while playing left for dead. These four are different in the way that they have different lighting. Top left is lit by a fire which would give a really good glow to the scene. Bottom left is lit by a single ray of light from the window which would create a good mood to the scene. Bottom right is lit by a strong, single overhead light which would cast rich, dark shadows, and top right is general lighting but still containing some shadows for depth along the corridor. Each one is inspired by left for dead.