So I only recently found out about the casting of Oberyn Martell...

[ravenstar84]

"The salty Dornishmen were lithe and dark, with smooth olive skin and long black hair streaming in the wind. The sandy Dornishmen were even darker, their faces burned brown by the hot Dornish sun. They wound long bright scarfs around their helms to ward off sunstroke. The stony Dornishmen were biggest and fairest, sons of the Andals and the First Men, brown-haired or blond, with faces that freckled or burned in the sun instead of browning." ~ A Storm of Swords, p. 520

Given GRRM's response to the casting, I'm getting the feeling that his version of "dark, olive skin" is someone who looks like me.

(I'm a light skinned yellowish Southeast Asian in case you're wondering.)