you want to see what a 3D game looks like developed from the ground up?
http://sintelgame.org/downloads/
Basically I guy took the media art of Sintel and tried to make a game around it in blender. Amazingly the game does run but it is resource heavy. I was thinking about tweaking it for my own designs, but looking at his rig can give you an idea of just how fucking complicated things can get. And that's not to mention all the python scripts he's got going. Anyway, thought you guys would like to see an example of a free, opensource game that even runs on linux that you can compile on your computer, or dick around in the editor to see how he put it all together.