Here's some interesting pictures of information about different eye colors for Elves and other races! Use it as you wish, I'm sure it'll help with your future RP and character creations, or just give you some nice information for the day.
I'll give credit to where I got these from: the "Night Elves" fan page on Facebook. If you have Facebook, check it out! I don't know who runs it, but they do a good job at posting Night Elf art and lore. https://www.facebook.com/pages/Night-Elves/339660622843569