I knocked this up in photoshop to chuck through the "rasterbator" for my loungeroom wall....
Basically just de-coloured everything with the colour tool, removed the background, then took to the car proper. I've used the lasso tool and paint brush tool to , bit by bit, replace all the surface textures with solid greys. I guess the end result is sort of vector inspired, dunno...
Far from perfect but should suit the purpose.
original