The chicks will be a mix of whatever your rooster is and whatever the hen is. I get pure buff orpingtons from mine because my rooster is one and so are a few of the hens. But then I also get some interesting mixes that are obviously BO over RIR or Australorp. i did get some lavender orpingtons, but I had a LO rooster at the time. He has been rehomed, so I won't get them anymore. It will be whatever a BO over LO looks like. Should be interesting. However they turn out, they will be big fluffy chickens. I love all orpingtons.
I also now have 4 leghorns. Interesting and skittish little birds.