Everyone is looking good. Did your Orpingtons throw the two chicks PR hatched out? I'm going to guess males, but the Columbian pattern is interesting. I'd agree that your pullet that is getting lighter is probably a Blue. And the icy-blue, pale hen is gorgeous! I know the standard prefers them darker than that, but she's very pretty. I'm still liking August, the Lavender cockerel. He's filling out nicely.

It's amazing how much larger your chicks are than mine that are the same age or older. I'd have to double check hatch dates, but Cookie's babies look massive compared to my little Whites and the Silver-laced.
Because the legs are white, I'm pretty sure the white chicks are from my laced orps. The eggs were collected while the flock was still in breeding groups. At 1 week old, I thought the Colombian one was male & the other white a female. Now my predictions have reversed. Of course they could both be male. With all the other September chicks, my predictions haven't changed.
The big blue pullet has lighter legs than any other blue I've ever hatched. i'm wondering if she's a product from my blue laced orp project. I bred Jewel to my SLO, and then bred the daughter back to the father to get blue SLOs. There's a chance i'd get blue orps & blue SLOs. All of my blue orps have slate legs - like my lavenders. This blue has pink in between the toes. The gray looks like it's painted on. If she is from that cross, then I'd like to keep her. IF the blue is Jewel's grand daughter (& not daughter) she'd be great to put with another SLO.
Jewel is my orig "big blue orp." She makes gorgeous babies of all colors. I know her genetics are not the best for breeding since she has lav, blue, choc, & recessive white, but the people who buy from me always want a "selection" of colors - and only hens. No one is looking for breeding stock, just pretty backyard hens. By breeding Jewel, I can get all those colors from just 1 hen. (Conserves coop space.) Her eggs are huge & easily identified. Because she's so awesome, her eggs are always set every chance we get. .
I love the blue and black orpingtons. When I hatched my baby lavender Orps, I was so happy to hatch out one that is Black split to lavender. Even if he isn't true black, he will be soo cute!
Is it just me, or are the glossy black chickens actually softer? lol
Im excited to see how my two Isabel Cuckoo babies will feather out. One is mich lighter than the other so I wonder if that one is male? I dont know how to tell with the Isabel Cuckoos
The black chicks do feel softer. Their fluffy down is smoother & their feathers are stronger. The lavender's diluting gene can weaken feather quality, so that's why you breed them back to blacks or blk/lav splits. If not, you could get nasty-looking feathers in just a couple generations. You probably can't visually tell a black from a black/lav split. Both look like amazing, glossy, black chickens. Most people want to buy the lavs & they're very popular, but honestly, the blacks are more stunning.
With the exception of playing with the chocolate or barring genes, most orps can't be sexed by down color. However, often you can start to guess when they're 4-5 wks old.