Horrayyyy!! Me likes readin' 'em!! =)
Now I can haz more!!!!!
I'm pretty sure the Vorta we saw on screen all had similar pale purple eyes... at least on DS9. Different shades perhaps.
Off the top of my head (thanks MA!) we've seen close-ups of
(you can kinda tell, maybe I'll make a better picture than MA's)
(also needs a better picture!! Can everyone see?)
(ugh, I'll find a better one tomorrow... blech)
I wouldn't say that means they can't be other colours, especially if it's artificial. (My poor Jem'Hadar have to spend so much time looking at Vorta, you see...)