Hmm, where did you hear that? I raise Blue/Black/Splash Orpingtons as well as, in the past, raised Blue/Black/Splash Ameraucanas and never saw that color referred to as "splash". Generally speaking, splash is a white bird with "accent" feathers. A splash Wyandotte would look like these below, except, of course, with a different comb. They look like nice healthy birds, though! Below are two splash birds:
Well, Tim is definitely the person to help you out with any genetics question-he's been extremely helpful to me in the past. I'm not sure how the chicks would turn out, but I'd guess they would be laced, just not very well. I know more about barring than lacing.