It's possible but I'd like to see something a bit more solid on it. As I said, you could account for it through selective pressures alone, as opposed to "abuse" of arcane magic. Now, they were selected for proficiency in that as well, and you're right about Jaina, but beyond that it's fuzzy. It could explain the similar appearance of the draenei, with their pale blue skin and silver hair tones.
Fel definitely does have that sort of effect, though, seeming to make anything it touches either ruddier or greyer (e.g. BE/Eredar/fel orcs.)