I personally am a huge fan of graffiti. I like the art of it not the profanity side. Graffiti Lovers are 15mm felt tip markers put together by hand, combined with a marlbe and 40ml of solvent-based waterproof paint. Summary: these little guys can write on any surface.
I found this website from DesignTaxi's tweets (Twitter). Check out the video on how they are made. #Verycool