To answer some of your questions no one shows the splashes in any breed that I know of. Ron is right, they are the byproduct of breeding blues. Some people breed the splashes to blacks to make blues, but the end result is that the blue babies are too light in color. The best blues come from a blue and black mating. The blue is darker and usually has the darker lacing that is preferred in Australia. I actually like the splashes in my flock and use them against each other looking for more black mottling if that makes sense. The blues and splashes have been around in Australia for a long time, but they only show the blacks and blues. Hope this helps. Breeding good blue genetics is a challenge, ask me and Chet.
Apps, Don't worry about the light beak on the splash. That is normal and we can't show them anyway. I sometimes get the pale mixed with some black or a horn like coloring.
Kurt