Cobblestone - nice colour for elephants. A nice warm shade of grey, tends to look different depending on the colours around it - see photos. The variability in the photos is not as evident in real life.
I think this would be a really nice colour in sculptural animals - like, elephants! Seals. Whales. Kittens.
... all is vanity, all the way; Twilight follows the brightest day, And every cat in the twilight’s gray, Every possible cat.