http://youreyecolour.blogspot.ie/2013/04/green-eye-colour-rare-human-eye-colour.html
Some interesting observations.I always thought blue eyes where the least common in Ireland at least but not so worldwide it seems.
https://uk.answers.yahoo.com/question/index?qid=20100514170531AAueXh9
From Aya ~ {Love and peas!} Lovin' baby .shameless copy and paste ..
The most common eye colour seems to be grayish blue, though. Not typically blue (baby blue). Baby blue is very hard to come by, as it is the complete absence of pigmentation in the iris (so albinos don't have "red" eyes, but baby blues). The less pigments you have in your iris, the lighter your eyes will be. So I assume grayish blue eyes have at least some pigmentation in the iris.
Green eyes are quite rare as well. Rumour has it that that eye colour is caused by a "faulty" gene that adds different pigments to your iris which cause a reaction that is seen as the green in one's eyes. I don't know the exact details, but that is roughly what it comes down to. And this is genetic, so it usually turns up in certain families.
Not to mention that the eye colour is determined by several genes, which means that it is perfectly possible for two blue-eyed people to produce a brown-eyed child if each had a minority of brown-eye genes but gave all of their brown-eye genes to the child, giving the child a majority of brown-eye genes and because brown eyes are a dominant feature... well, you know the rest

So What colour eyes do you have?