These remind me of some Columbian colored chicks I've seen, but not exactly.Chick 1
2
Columbian is the color seen in Light Brahmas and Light Sussex, Buff Columbian is like Buff Brahma, and Delaware chickens are Columbian with white barring.
Your chicks remind me of some of those. I think I'm seeing buff in at least one, and maybe white barring as well. Maybe a barred buff Columbian for chick 2?
I think they will grow up to have some combination of brown and black-- maybe a laced or double laced or partridge pattern, or maybe not that well organized but still showing both colors. They remind me of the color & markings of some Laced chicks I've seen, but I don't think they're quite the same.3 I have three of these, I thought they where black mottled but they have brown patches
I would guess black, without mottling. Many black chicks look like that, and it's fairly common for black chickens to have some white feathers when they are young, and become solid black later. (If it's a cross of colors, then it might be black with white or gold leakage when it grows up, depending on what other genes it's got.)4 actually black mottled? It’s chick down is a lot more silvery then chick 3
The chicks I've seen that were black with mottling had a lot less black in their down.
I got these chicks from someone, they might be mixture of colours, no clue what colour the parents are,
It can be hard to tell adult color from chick down, especially when they could be a mix. So what I said above are just guesses, based on them looking sort-of like some chicks I have seen. I'd love to see photos when they are older, to see how they look as they grow up!