They appear to be mottled. The middle one without pheomelanin (red/buff/gold), the other two with varying degrees of pheomelanin. The top one looks to be well on the way towards mille fleur. (Correct genes appear to be present; now just need to select to improve variety). The bottom one looks more like a speckled sussex in colouring except for the buff upper breast.
They are out of mille fleur hens and a partridge rooster. I have a calico rooster but he was not old enough to breed. I love the darker colors from the partridge but did not know if they were officially calicos or not. They are multi-colored and not just a solid with mottling so I was not sure.