GRFK DSGN Unlimited - 05 December 2012 10:43 AM
I think there was a mention of a blond vulcan in Spock’s World if memory serves.
http://www.amazon.com/Spocks-World-Diane-Duane/dp/0671667734
IIRC that’s the book with one of the funniest depictions of Vulcan formal debating technique I’ve ever read. (She bit his leg!) 
There’s also a scene with Vulcans of every conventional body type and colour under the sun — Earth’s or Vulcan’s — in one of Diane’s other books, My Enemy, My Ally. “Gigantic seven-footers, little delicate ones, slimmer than Spock, burlier (but no fat ones, that would be illogical) [...] fair, blonde, brunette, even several redheads.”