Well in case anyone is following this thread, the little buff brahma chick, that I was hoping was a female, "crowed" at me! It was so cute, and pathetic, at the same time!
I don't think the white ones are light Brahmas but I can't tell if they have feathered legs. I agree with your original thought, Colombian Rocks (I'm no expert thought!) if they have clean legs.
I got 3 chicks in June, thinking they were a breeding trio of Mille Fluer D'Uccles. Two of them (one cockerel and one pullet) look exactly like they should but the third is distinctly different. What breed do you think this is (first pic, dark neck feathers)? It is similar in size to "standard"...