Chocolate brown because they're so warm and deep. Blue eyes are also rather nice when they're intensely blue and I do think that green eyes can be rather sexy. Unfortunately however, my eyes are an amalgamation of all of these colours, which rather than creating a completely new and unusual colour, just looks like a murky pool of ****.
I really like green eyes but they seem to be pretty rare, and I love blue eyes too. My friends are all obsessed with brown eyes, but I think they're kind of boring (I am allowed to say this because my eyes are brown ).