I have brown hair that deviates in color depending on the season. For instance, in summer it will be a lighter brown and softer due to increased sun exposure, but in winter it'll be darker and coarser. I have dark brown eyes which I absolutely adore. When my pupils dilate in the dark it looks like I have completely black irises. Creepy, but cool at the same time.
If I were to change my hair and eye color, i'd change my hair to either silvery white, blonde or black. Red, purple or green eyes would be fabulous. However, i'm happy with my eyes and with my hair, even though it is an incredibly temperamental hard to fix being with a mind of its own. @___@ It would take a lot for me to change them. :O