Unless the blue and splash birds are Australorps, I'm not seeing any of those breeds in the pics. I'd have pegged the blue and splash birds as Marans, but they're clean legged...
anyway, they look healthy, that's a start. If you're looking for green or blue egg layers, look for birds with pea combs. They'll often also have a beard/muffs and dark legs, but the pea comb is closely linked to the blue egg gene on the chromosome, so they're often together.
I have several mixed breed birds that have black legs, not sure on the exact genetics behind leg colors. I don't have any Australorps. My two base breeds are barred Rocks and Easter eggers.
I just have to point out the rooster that fathered those birds wasn't a pure barred Rock, or all the birds would be barred to some extent. He may be a black sex link, where only half the offspring are barred. Really doesn't matter, they're nice mixed breed bird and should lay well for you. Go for pea combs and classic EE signs to better your chances of colored eggs.