Well, after pondering over the possible eye colours for humans, it got me wondering as to what people find attractive/favourite colours are in terms of eye colour and have presented a poll which can be answered and general discussion about eye colour.
Brown Blue Gray Green Hazel Yellow Black
Looks like Blue and Green are really going at it...
I think it depends on the individual colour, a lot of the medium blues and browns aren't very striking and I only notice them if they are really light, dark or bright. Personally I have near black eyes so maybe I'm being biased