Also, there is not nearly enough differenciation between the coloration of the feathers on the head vs the body feather. In a BBS blue, the head would be almost blackish blue, while the body would be blue with very dark lacing. Your birds just aren't exhibiting this. They look very much like Lavendar Orpingtons.
http://www.feathersite.com/Poultry/CGK/Orps/BRKOrps.html
^ Here is the Orpington page on Feathersite. Have a peek
http://www.feathersite.com/Poultry/CGK/Orps/BRKOrps.html
^ Here is the Orpington page on Feathersite. Have a peek