I don't really think I care so much about the eye color as much as I care about the personality someone shows behind their eye and shape of the eye. I think Grey Hazel is a nice color, it's one of the rarest and because they basically can change all sorts of colors. My friend has grey hazel anything from depending on his mood, the environment, or what he's wearing they change when it's raining they're a silver grey, when his mood is like an okay day for him they're green/light brown and when he's wearing a green shirt obviously they'll be green. But if I could have violet/purple-ish eyes of black eyes that'd be kind of cool.
My eyes are blue-green. As for the other, though, it doesn't really matter I've noticed that I mostly like dark brown (or just brown) eyes. It isn't a favorite but it does seem to appeal to me slightly more.
My eyes are amber. I prefer guys with either green or green/brown hazel eyes. It's not a very strong preference though, I know some girls date guys because of their eyes but I just consider pretty eyes to be a nice bonus.
Like, check out the eyes on this pretty SOAB: link
It's a tie between blue and green. But I've seen some very beautiful brown eyes too. :) It all really depends on what shade they are. Lighter eyes tend to be more interesting to look at, especially if they have a few darker spots here and there.
I have brown eyes and I like girls with the same but that's usually because I like girls with darker hair as well and it just seems to 'mesh' well. Although I have dated girls with brown, blue, green, etc. eyes so yeah, not a deal breaker at all. :)