for the car paints (an others) have a look at matlib from blender artists, it comes with about 20-30 premade mats maybe not what you want but might give you ideas

 

for the exporting there is a plugin (http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2829354      here for details) works quite well for props and makes the required poser files for you just have to watch the scaling (as always)

or you can just export as .obj then import and poserify as usual

 

hope that helps