There is a 5th gen painted flat black on here
http://www.camaro5.com/forums/showthread.php?t=48448
I'm not too crazy about it. I don't know much about insurance but if they have to sand it all down and repaint the entire car I don't see why they would have a problem unless your doing a drastic color change. If it's just a few panels I can't see insurance paying for an entire repaint.