This was actually one of the first things I did with Blender when I got it! When I was a teen and Blender was at 2.5 or 2.6, I booted it up and tried to recreate the lighting in some Quake 2 maps that I had downloaded. Then I used the Shift + ` shortcut to go into first-person and re-explore my childhood in 15-fps ray-traced perfection.