[David G4EBT]

I did something similar with a 'BTH' logo printed on white decal paper from a scan of an original decal applied to the mahogany cabinet of a crystal set. In fact the wooden area around the letters when applied to a cabinet top was quite a close match to the cabinet on which it was applied, so tinkering about with the brown background became unnecessary in the end. (The decal was cut around the outer perimeter of the circle before applying it).