Yes, I think they are great. In general, eye colors depend on eye's iris pigmentation and light scattering frequency. Due to the complex eye color genetics, various eye colors can occur in different parent-child combinations. Gray eyes are most common in northern and eastern Europe, more than north west Africa. Under magnification, gray eyes exhibit small amounts of yellow and brown color in the iris. They seems beautiful. Also, when people with a pure grey eyes gaze on you, you can feel a holy and sincere sense because you can easily look into the deep of their clear eyes as if you touch their souls. By the way, people with such color need to care more about the eyes because they are at increased risk of uveal melanoma, as well as blue.