What color contacts would look good with my eye color?

I wanna get contacts but what color should I get? I have dark brown hair, about leona lewis's complexion, and dark brown eyes that are shaped like Nancy Ajram mixed with Jessica Alba's. What color should I get? I want blue or green but would that look good. What color contacts would look good with my eye color?
I have dark brown eyes, and I just got opaque blue contacts a few weeks ago. They look alright, but they're a tad dark. They also tend to slip out of place a lot. I think you'd look good with blue contacts.