One more update on these pullets. This set of 6 "olive eggers" consisted of 2 solid black pullets and 4 barred ones, and all are laying now. The solid black pullets lay green eggs - one more of a brownish green and one more blue-green.
As for the barred ones....I've got 3 brown eggers and the 4th's eggs are pink with white splotches. I know there is a chance of brown eggs with olive egger crosses but...you know, feed store chick bin shenanigans and all that...and the fact that there was a barred rock bin riiiiight next to the egger one...I do wonder if I actually ended up with a bunch of barred rocks LOL. If it was an oops-into-the-wrong-bin sort of mixup and not simply a matter of being really unlucky with egg color, then I'm just going to count myself lucky I actually got all girls.
Whether I have barred rocks mixed in or not, I did notice these pullets collectively took their time to start laying and haven't been laying every single day either. I guess it could just be the fact that it's winter but I'm still hoping that's a somewhat good sign from a reproductive health standpoint.