Padawan,
It's a process. We can do it on byrds. We can actually etch any patern or picture, but there needs to be a higher volume.
I think some sort of feather pattern (similar to that on the Crow and Raven) would be a neat etching idea for the SS Byrds. Of course, I'm not sure if it would be popular enough to justify a large batch, but I'd certainly love an etched Robin or Meadowlark.