Hi, I have PKU an as u can see I have brown eyes, and light brown hair, it was blonde when I was younger, but has gotten darker as I have got older. I do not think that this has anything to do with levels or PKU. Although, I thought it was ginger hair and blue eyes. All the PKU conferences etc I have been to I have been the only person with brown eyes and brown hair! around 5out of the 7 in the group were ginger haired and the others were blonde. I personally think there is just as much chance of having any colour hair whether PKU or not!