What kinds of chickens could these be.

We have four chickens, and are fostering six more for a friend.  The four we bought came from a school fair, and we don't remember what the guy said about breed.  I was looking to see if anyone had any guesses on the breed and gender of a couple of them.  First, the one in the foreground of this picture.

And this white and gray one.  Pretty positive this one is a rooster.  Still curious about breed.