Something I like to do, is paint the soundboard to a color that would accent the rest of the call, then glue in a breast feather on it. then sign off to the side of the feather. I also have a laser shop that does all my laser work. His laser will do nice work on glass also. I haven't done one yet, but have plans to do one. That is another option if you can find someone that does laser work. A lot of trophy, and award shops have laser machines and can do custom work for you. Good luck with it. Would love to see what you come up with.