There are German guys, calling themselves "cuscadi" (custom scales division). They make scales for knifes you send them, so real custom (thinking of getting olive wood scales on my Manix 2 or carbon fiber on my SOG Vulcan... Nice!), but they do have a variety of scales for some bestselling knives in stock - SAK included. If you send them your SAK, they will pimp it, or you just order an already pimped new SAK.
Here´s the shop. (Isn´t that carbon fiber Tenacious a beauty?)
http://shop.cuscadi.de/