determining kitten eye color?

Hey folks,
I've been wondering what nile's and frasier's final eye colors will be, I know that it takes quite a while to develope (and isn't completely predictable), but I was wondering, if cat's with copper eyes (orange, amber, etc) start out with greenish/brownish/greyish eyes? Nile's eyes stayed grey for a long time, then appreared grey w/ brown in the middle, now they look sorta yellowish olive green/brown when seen head on, but from the side they look orange. Fraiser's eyes looked yellowish-green for a long time (started turning before nile's eyes), but now they are looking a bit darker/murkier...so I'm wondering if some brown or orange is developing in them also. I'll get some updated pics to post since the eye color change has just started happening in the last couple of days (after the previous pics posted in this forum). They are about 9 weeks old at this point.

Thanks for your help!
Art

Leo (red tabby) had blue eyes until he was around 5 months old and now he has beautiful golden colored eyes. Spooky Bear (black) had blue eyes of course when I got him, then I believe they turned an olive color at around 10 weeks old and now are very vivid green. I don't really remember Tabitha's eye color changes but it's a yellowish color now.
I'm sure someone will be along soon that can give you a better idea!