I guess you could say that MY eyes are dark brown :D
Dark green. :)
Mine are green towards the pupil, grey-blue towards the outside, and just blue in the center.
Mine vary in color, too, but I am not sure if it has anything to do with the lighting. The lighter your eyes are, the more sensitive to light.
Mine are light blue. They don't change colour but my pupils are very sensitive to light- causing them to dilate often.
Mine vary between blue, grey, and green.
My eyes appear to be black when I am not in light.