Some believe that Tyrion Lannister is actually a Targaryen, his parents being Joanna Lannister and the Mad King, King Aerys II Targaryen. Aerys certainly thought Joanna attractive, and he had no real qualms about rape. In the books, Tyrion's hair is described to be so blond as to be white -- see: Daenerys, Viserys, and every other Targaryen -- and as having one green eye, one black (Daenerys' eyes are written as so violet they're nearly black). The theory is a bit out there, but not as out there as the Mad King was!
(Peter Dinklage as Tyrion Lannister, courtesy of HBO)