Interesting, this shows the probably of a child’s eye color based on the eye color of its parents!

For more obscure eye colors…. 
About 2% of the world has Green eyes. 
Amber is a bit more rare, having a yellow-gold tint, with copper/russet undertones. (Sunlight through a glass of whiskey, you know who I’m talking about) (Actually, he has Hazel eyes, but occasionally gets terrific lighting that makes it look amber) Light brown eyes are often mistaken for Amber, but there is a difference - The yellow and orange is far more distinct in Amber eyes. 

Violet/Purple eyes are the third rarest. Having Occular Albinism is far more common than full Albinism. 

It actually results in super pale blue eyes, but the red blood in their iris will often show through, resulting in a pale purple tone. 
It comes with a host of eye-related disorders and sensitivities. (Mostly because there is no pigmentation in the iris, therefore your pupil dilating or shrinking has very little effect on how much light actually enters the eye - Eye damage occurs very easily, and the optic nerve has a harder time developing)
Black eyes are second-most rare, occurring from a Super-melanistic genetic trait similar to Albinism, but on the opposite scale. Many people say that true black eyes do not exist. They argue that black eye color is rather very dark brown color, so dark that it appears black.

Full Albinism resulting in red eyes is the most rare. 

Just curious, what about grey eyes? Because one of my friends has grey eyes and I’m not kidding in the slightest.

Gray eyes are the same as blue, genetically speaking.
One theory is that in gray eyes, there are larger deposits of collagen in the stroma, resulting in Mie scattering rather than Rayleigh scattering (which is basically the difference between seeing a blue sky and a gray sky, for an analogy).
The other explanation is that there might be different concentrations of melanin at the front of the stroma.

thank you science side