I like how Alex described his eye color as "Hazeley-Blue...but they change color"
I think it has something to do with the marbled combination of the goldish brown at the center, the gray blue around that and the darker blue flecks throughout and around the edges. Depending on the light and the
dilation of his eyes they range from dark gray, light gray, green, hazel and blue...depending on the distribution and blend of the color patterns.
Or like someone once said "if you can't tell what color Alex's eyes are" at any given time "just look at his shirt"...they almost mach exactly 99% of the time
His environment effects them as well. Now that he is in Hawaii surrounded by blue skies and water they look varying shades blue most of the time. But back in the ML days he was around a lot of black and brown colors and he was indoors or it was night a great deal of the time. So his eyes looked mostly Hazel or green or a dark grayish blue. When Mick was on the beach they appeared a dark gray blue so go figure

His eyes are simply a beautiful phenomenon unlike any other I have ever seen.
Well with the exception of my Grandfather...he had brown eyes with a bright blue ring around the out side. COOL!