Your top hens look like cochins, but the dark color of the comb makes me think they may also have silkie heritage. That's a popular mix. How many toes do they have? Five would be another indicator of silkie in the background.
I'm not sure on the little brown speckled birds--d'uccle? They look like poorly patterned mille fleur, but I'll defer to the bantam folks.
The black and white ones look like they could be Silver Pencil Cochin Bantams, and the others do resemble Mille Fleur d'uccle Bantams. Not sure though, I'm not really a bantam person either. I'm sure someone will come along and help.