Please contact John Barton. He made me a 4x8 2-toned butterfly case but the 1st one was a little tight so he made it into a 3x6. it's awsome looking and was a custom job for me called the Cardinal, now there are only the two: a 3x6 & a 4x8. it's butter brown and dark brown.
Here a link to pictures he prepared for me for the 4x8 but I am told the 3x6 is identical (or very, very close):
http://www.jbcases.com/cases/cardinal/
I hope you don't mind John, I know you wanted me to have both but I can't do it at the moment.
Good luck,
Dave