I have dark brown eyes (almost black), light olive skin, and black hair. All I use is a bit of black liner on my top lid and a very thin line on the outer corner of my bottom lid. Then, I highlight my brow bone with a light beige shadow (about a shade lighter than my natural skin) and add mascara to my lashes. A lot of people with very dark eyes seem to shy away from black eyeliner, but I think it can look nice and subtle, yet still sexy. I guess it's all in the application technique...
To answer Vans question.. I, personally, think that very dark brown eyes should avoid pastel colors. For medium and light brown it really depends on the skin color. Dark and olive skins look better with richer colors, imo, and lighter skin doesn't work as well with very dark shades.