I love this statement by the APBR:
By far the rarest of Pit Bulls are those that are Merle. The Merle Pit Bull is distinct in its genetics and many times exhibit unique color schemes and a trademark blue eye. The blue eye or eyes are also referred to as crystal and glass eyes. The Merle Pit Bull is the rarest and the demand for this variety is rising quickly. At the American Pit Bull Registry we are lucky to have many Merle Pits registered and are able to provide several pictures of Pit Bulls with Merle genetics.
Pffffft!!! Basically they just said that they welcome cross breeds. ROFL!