What kind of combs do they have?
First thought was Sapphire Gem but they have straight combs, Wyandottes have Rose combs ... Yours look to have Rose combs.
I ask way back when they were wee willie's and the great minds here told us then that they were Blue Wyandottes...we have silver laced Wyandottes and gold laced Wyandottes but these two don't show any of the characteristics of their 4 sister Wyandottes....we affectionately call them our "cloud girls" or our Little Emu girls. These two pullets are the shyest most easy going chickens we have raised thus far and an absolute dream to watch grow up. I would without hesitation have a full flock of these gorgeous Blue Wyandottes.