Natural Selection 2 looks... awesome..
The images are huge, so i'll just provide direct links.
http://www.unknownworlds.com/blog/2007/04/11/ModularMachinery_Environment.jpg
http://www.unknownworlds.com/blog/2007/03/29/ComputerTerminal_Environment.jpg
http://www.unknownworlds.com/blog/2007/03/29/ComputerTerminal_Sketches.jpg
http://www.unknownworlds.com/blog/2007/04/11/Lmg_sketch_01.jpg
http://www.unknownworlds.com/blog/2007/04/11/Lmg_sketch_02.jpg
http://www.unknownworlds.com/blog/2007/04/11/Lmg_sketch_03.jpg
http://www.unknownworlds.com/blog/2007/05/05/CEnv_production001high.jpg (massive)