Clyde - I'm on a business trip and can't quite complete this, but here's a start that you can edit in GIMP. I started by using Color/Threshold, then Color/Invert. You need to clean up the leaves (I started that in the lower right corner) and thicken some lines (I thickened around the crown and the bottom scroll). Then eliminate floaters. You would cut out the black sections leaving the white as a medallion to be glued to a backer board.
I hope this helps.