That could work- the only difference between Buff and Light/B&W Columian is the latter has Silver.
I do not recommend anything feather legged. There are several genes for leg feathering and they also have variable expression which means a bird with the gene can show anything from lots of visible to apparently no visible feathers however it does have it genetically.. certainly something that can be a problem for generations!
How about Columbian Rocks? Actually it is possible there is already Columbian in the Orp stock, would not be surprised if it was in Buff, as an modifier gene to help create the clean buff body(Co is pretty good at clearing up "off" color on the body). Perhaps crossing the different Orp colors can tease out a bird with visible Columbian pattern..
I used a white Columbian Wyandotte roo over buff Orp hens and the offspring came out buff, with columbian markings, and straight combs....except for one rooster who had a Wyandotte comb.
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From what I have read I dont think the blue gene is involved, but the self blue. So, I guess it is possible. Most people make the lavender orpingtons form either Ameraucanas or Old English game LF. A lavender Coronation would be beautiful on the Orpington.
What variety of orpingtons do you have to work with? Can you obtain a light sussex?
Currently I don't have any birds at all. I just like to enable the people that do...lol And when I do get birds I like to be able to go back to things I've bookmarked or written down and be able to try some of these things out.