I don't think any of them are silkies...not only do they have 5 toes, but they also have black skin/beaks and feathered legs. They also have "top hats" and appear fluffy headed.
Do you have any more information on your chicks? Feathered or clean legged? how many toes? Top hats?
To ME, the orange and the one in front of the standard are cochins of some type. The other two, I am not sure. The one in the back corner MAY be a porcelain(ours are a lighter gray color though, but it could be the camera/lighting/angle).
Half the fun is identifying the breeds you have, we have been having a blast trying to identify our babies!! Good luck and enjoy them, theyre cute no matter what they are!!