The new norm, flat / no shine colors.......
I like some of the muted satin colors, like a burnt orange, gunmetal-blue-grey type of thing, the silvers. The matte blacks just look mostly like black epoxy primer. . I'd paint a car with some silver, then slightly flattened clear to tone it down. Makes me think of futuristic.
Nice satin blue color:
http://www.supercars.net/gallery/119513/1644/704294.jpg