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Black mats show the least amount of dirt/stains and black essentially works with any interior color. If you can grab these black mats for a deal, then do so. You can certainly swap them out for other colors if you change your mind down the road....
I have black mats (aftermarket) with a cashmere interior. I think it looks great, but I've got a sort of black/tan mixed color scheme going in the interior.
The car is Quartz Metallic with Oatmeal leather and Black top. You can just see the leather patch with my wife's monogram at the bottom of the second shot if you enlarge it...
The mats were the only thing on the car that looked worn, and we chose black for the reasons others cited above, as well as a more desirable contrast that coordinates with the exterior. We're happy with the choice.