Used four thin slabs to create enclosed tunnel hallway along the x axis.
Created a directional light that pointed into the hallway from the far end.
Gave the walls, floor, and ceiling of the hallway different colors and specular/shininess 
values by trial and error until desired color is achieved.
Created point lights near the end of the tunnel hallway.
Positioned the camera at the other end of the tunnel, until it's dark enough that the point 
lights don't wash out the scene with overwhelming white color.