Those are Blue birds. From a glance they look to be yellow skin. That's not true Orpington. If the yellow washes out to white later or not I couldn't say. Where problems arise in blue and any color variation is where did that color come from? It has to get into a line from somewhere so if these were recently made blue then sports of off skin color and such will arise. The trick will be to select for the proper traits of breed for future breeders.
Blue results in blue, black and splash colors. What I see in your pics are 4 splash and 2 blue. No black. With blue there is almost always pigment on legs. Some breed standards allow this others do not. Orpington allows, Plymouth Rock does not for example. If your unfamiliar with blue genetics I'll give a quick overview: The blue gene when paired in a bird results in splash, single gene is blue and no blue gene results in a black bird. All three colors are in Andalusion blue. This is not lavender or what is called self blue but Andalusion. A splash bird mated to a black bird will result in all offspring having one blue gene which feathers out blue. By using all three colors you can move the shade of blue in blue birds to where it should be to standard or just where you personally like it. By breeding black you will darken the offspring blue. A blue bird to black will result in blue and black colored offspring. Those blue will be of darker blue than the mother. The reverse is true using a splash. Blue on blue mating results in all three colors for offspring and a wider range of blue shading in blue birds.
Forgot to mention lacing. True Andalusion blue varieties should have lacing. Don't be surprised if your's have very little or only a hint of edging. This inherent characteristic of Andalusion blue color has been all but bred out here in the United States. It's a shame really. It is something to look for and select for in addition to white feet in your Orpingtons for future breeding. Only using white are the most white skin combined with birds with most lacing will move you in the right direction.
Another thing that would move you in the right direction is to get a pure black Orpington of good quality. Male or female and may depend on what you need, evaluate when these are grown out. As the old breeders like to say "build the barn then paint it." With a black Oprington of fine body type and obviously white feet you'll take these birds and dramatically improve them. Being that it's not a black from Andausion it will lack the lacing gene but as stated that is all but lost already in all of United States. So it sets you back one year in that regard but builds the barn to paint. From those improved birds you'll continue to select for lacing and in that you will see improvement over the years but may never realize the full lace pattern this color variety should have. Take care in the first mating to use a bird with some lacing or you'll never even move forward in that regard. So one of the birds must be a blue, of which you have two, and it must show some form of lacing/edging. Use that blue and single mate to a pure black Orpintion of whaatever sex it takes to mate and your on your way.
Every time I look at those pictures I only see yellow. Another thought is to let them grow out and determine what they most resemble for breed and get a black one of those to move forward. These birds are at a turning point and in this place the destination is up to you. Blue Plymouth Rock could be in your future. There are no black Rock excepting from blue but they are obtainable. Blue Wyandotte or even Cochin. Hey, it's all doable the choice is yours. Those all have yellow feet and Wyandotte rose comb is dominate so doesn't take long to get that in flock. White skin doesn't take long either. Your at a cross road with these birds and I believe it's due to recent addition of this color to Orpington you got these birds from.
Edited by Egghead_Jr - 5/5/16 at 11:09am