I haven't looked at Jubilee orpingtons genetically, but if it runs like the sussex and mottling (Thing), the crosses will be split to speckled, meaning the mottling will be hidden under their base color. Your splash marked birds (biscotti, sugar and flour, I think) will likely throw blue babies: 1 copy of the diluted black gene. That could be an interesting look with the jubilee: red/gold leakage, possible blue instead of black mottled.
Egg color: orps are brown egg layers, so ALL your blue egg babies will lay green eggs