cycles test,
texture’s all cycles inbuilt
addons used:
mextrude, zmj100 inset face fillet, zmj100 inset, btrace, add_mesh_stairs
Blender 2.62.2 rev 45101
Really interesting objects 
I would be interested in seeing it with more light? Maybe adjust exposure in the camera settings or strength of the light sources.
finished this test:
added more objects.
6 hours render 500 passes
cycles render test:
Free honda model, Blender internal, Realistic Toon style:
makehuman import test:
btrace addon test:
free car models test