Is there even such a thing as ugly or beautiful eye color? All colors are equally beautiful. The beauty of eyes depends not only on it's colouring, but also shape, eyebrows, skin and hair tone.
And I don't believe in that "exotic" equals "beautiful" theory. I live in Greece, where most people have either brown or blue eyes and these are my favorite eye colors. I'm not very fond of grey or green (I dont think it's ugly, though).