My first commercial use of Blender is a looped tunnel animation for Gameboy Advanced, in the game “Jimmy Neutron” from 2001 (published by THQ). My work in this game mostly 2d graphics, level editing and game design, but in the multiplayer I have made some tunnel animations.
Here you can see: http://www.youtube.com/watch?v=mdXFkHY5vIA
The second part of this game we use Blender as level editor! Maybe I will make some movie from it.