This is what I did (close enough so you can see where the chisel slipped. Sigh).
Hollowed out the headstock in a circle, using a circle cutter for the edges, same cutter to make a circle of veneer and abalone (I think), cut in halves and a Laser printer transfer/decal on top. Goodness knows how many layers of Birchwood sander/filler on top (don't worry if it wrinkles) and tru oil finish. I was worried about the sealer/filler solvent and the decal, but as you can see it was OK. Scan or photo your sig, tidy up the graphic and make a decal from it and you should be good to go.
