Chances are you'll have to reach out to one of the makers, Batninja, Arkady, etc., and see if they'll do one for you. Because that's not a color used by most you can expect to pay a few dollars more since they won't be able to take advantage of a bulk discount.
Batninja did a custom gray color for my Jodo. I paid a little more for it but it was worth it to have his workmanship.