Brown eyes, never really thought much about it until I started cosplaying... it's surprisingly easy to get color contacts that entirely cover dark eye colors now! I have some for my Sephiroth costume that turn them to really light green but look natural. (Though not so much when I'm not wearing the wig - seeing light eyes with my dark hair was weird.)

Like someone noted above in the thread, I also don't tend to notice eye color unless I really am looking at someone for a long time. I recall one time when I had a long-distance boyfriend fly in and we met for the first time, I took him to one of my favorite places outside on a sunny day, and looked at him and went "...omg your eyes are GOLD." Don't think I've ever seen that eye color again, but maybe I haven't looked at too many other people closely enough to notice since then.

I've since used contacts for all different colors for cosplay, but for awhile I've felt like I should have had dark green eyes. Probably because my natural hair color (when I'm not dyeing rainbows into it) is dark auburn, and red hair/green eyes is a thing. But I don't, and I'm not going to wear contacts every day for aesthetic reasons, heh.