Hard telling with saying exactly what offspring each may produce if they got other possible genes hidden. Like recessive traits, or extra Melanizers, or such. Since these are basically EEs.
Splash Pyle chicks look like these.
The red is part of their coloration.
Just wanted to clarify with your birds colorings: #1. Is Black Copper(Red Birchen), it's an actual color. Since this is in the Extended Black genes the Birchen is a dominant trait, so most offspring will be Birchen unless he's split, or carrying only 1 copy. If he's split, then about half of the...
Not unless they carry blue. Any bird with the blue gene will follow the Black, Blue, Splash Inheritance.
They could have typical colors/patterns, or mixed colors/patterns really.
Looking into these birds, they just appear to be pretty much another color egging mixed breed like Olive Eggers. But only breeds true for Blue egg color, not so much for body type, feather color, comb type, or leg color. Pretty much just a variation of blue egging EEs.
If all your birds are based on BBS inheritance, then that's all you're gonna get.
If you want better chances of other colors/patterns, add Buffs, Reds, or even Barred/Cuckoo to the mix(There's even more color options available too). But even these crossed may still end up with the BBS...
Personally, I would just use all three to mix things up for more color variations, then use the offspring from each for next breedings.
#1. Is Black Copper. (Red Birchen)
#2. Is Golden Duckwing, if not Partridge.
#3. Is a Splash Pyle.