I’ve heard of a painting of Anne Boleyn with blonde hair. Here it is.
Though to me this actually looks like a practice portrait or even just a study for the more famous versions. I put them in order of how they were most likely painted in levels to get the more lifelike final copy.
Anne Boleyn by an Unknown Artist. (National Portrait Gallery, London)
Anne Boleyn by an Unknown Artist. (Hever Castle)