It's night here now and so can't grab a photo yet in natural daylight. I did take this one tonight however. The lighting above was from a warm white Cree LED flood light so take that into consideration.
The second hand on the watch face (Watch OS 1.0.1) is a silver gray color so the band is definitely a cool brown/gray. SS Apple Watch, 42mm btw. I'm looking forward to seeing it tomorrow in daylight and will come back and add some photos. I like so far. I love the feel of these sport bands. Can't wait for WatchOS2 to get the Stone second hand.
Also took this photo, same lighting, showing the top band in Stone with the bottom band in White to show the color comparison.
More photos: These were taken in the a.m. It's really a taupe color and the shading can change with lighting.