I was at my dealership this morning getting my free car wash and I saw a Flint Mica on the lot and I have to say it's a pretty color. It's like a compromise between Silver and Black. If you want something in between these two colors, then Flint Mica is the way to go. It looks black at night and Silver Gray in certain angles during the day.
2008 S.Gray BMW 550i Sport
2009 Black MB GL550 (Wife's)
2010 Silver Honda Accord EX-L V6