My long standing crush had brown eyes, and they are incredibly beautiful! I think it's partly what you do with them and how you use them or use colors to make them seem more amazing and noticeable.
A girl I know has blue eyes. Nice blue eyes, and certainly it's one of the first things you might notice about her, but I wouldn't have counted them as particularly gorgeous. One time, she wore this one blue t shirt though, and it made her eyes really seem more noticeable, and more of a light blue, so they were really pretty. I was almost distracted completely distracted by them, and yet normally, I wouldn't say they're particularly pretty eyes.
Now, I seem to be drawn to green eyes, I call it God's little cosmic joke. Green is not a favorite color, it's sometimes difficult to distinguish from others (hazel or gray), and I don't go looking for girls with green eyes. But I'm drawn to them, or for whatever reason, girls who happen to have them.
BUT there's a girl I just met with green eyes. I'm not attracted to her; I am with Ms Brown eyes, my second choice crush has blue eyes.
Last girl I dated had brown eyes, and we could be very passionate; it wasn't the eye color, it was the personality she was showing, the perfume she wore, they way she handled herself. I would say that with most of the women I'm drawn to, it's not always just about eye color, but the way I feel around them.