Yes, and khaki and platinum..... anything that has a black base and diluters. My black Araucana flock is my foundation. I work to improve it each season and they will bring along the other projects as well. I have 2 duns due to hatch this weekend, if I'm lucky, and 3 more under one of the Dun hens. I have several chocolates now from the chocolate Orp/Ameraucana cross hens to their sons who are half Araucana. Both of the chocolate hens are setting at the moment (another project) and those are not from my hens but are Ameraucana's that are split to silkie feathered (no Silkie breed involved) and those can be black, chocolate, blue, splash or mauve. I plan to see how the silkied feathering looks on a rumpless fowl but I only plan to work on chocolate and black in the silkied project. I have large fowl and bantam, the bantam is a bantam double tufted/rumpless hen to a black silkie feathered Serama. I've done that cross with very good Araucana type a few years ago in blue and they were very small, extremely friendly and the feathering was sooo soft. I think it will go well for a silkied bantam that is rumpless. They will all lay blue eggs.
The latest project will be a chocolate spangled Araucana. I have that started as well.
I hope I can make beige. It's more complicated than just crossing dun to chocolate but I think if I figure it out, it may be able to be made to breed true.... I hope.