While the above is a general idea of how many eye colors there are, truly no two pairs of eyes are alike, which is part of what makes each human wonderfully unique. In some cases, combinations of various colors may make identifying the eye color impossible, and some eyes that appear hazel may look blue depending on the season or clothing.
Perhaps most fascinating are heterochromatic eyes, where one person has different-colored eyes. Other than their appearance, heterochromatic eyes are no different than any other eyes.