I wouldn't have thought that anything other than sand or compost looked particularly natural but I wouldn't personally use either.

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Home of Heidi - JRT x Lancs Heeler
Gerbil boys - Domino, Grub, Cameo, Chalky, Sokiro aka "Socks", Batman, Duma, Mali, Sputnik, Skip, Luka, Woody
Gerbil girls - Pumpkin, Togo, Mottle, Speckle, Luna, Kenya, Chibi, Flick, Waffle, Blaze, Shubie, Foxy, Bunny