It is some bizarre kind of quirk of mine that I inevitably date a girl with very strange eyes. For instance, my first serious girlfriend had VERY bright green eyes. The second major girlfriend had strange brown eyes. The third had a sort of hazel that tends to wander back and forth between green, blue, and brown, if that makes any sense at all.
Aside from the eyes, I've always seemed to gravitate to girls who are NOT rail-thin. I hate that in a girl. It means - 95% of the time - that they either don't eat enough, or their metabolism outpaces mine, making me feel fat, and that simply won't do. (I am relatively thin, so if you could see a picture of me, you would realize how funny that really was.)
Also, everyone here to said that they prefer "cute guys/girls over hot guys/girls" is dead on. Because of my second point, I just can't stand someone who takes all of their time to look like a magazine cover. I prefer cute.
The amazing part is I am lucky enough to have these traits in my current girlfriend. I don't deserve her.