Custom inlay. This is the logo of the band Frightened rabbit (well worth a listen) inlayed into the headstock of a fans guitar. Inlay was done in memory of the late lead singer who took his life tragically early! Although it's a sad episode it's nice to have the skills to help someone make such a personal gesture.
These pictures show the whole process from planning, cutting away the wood, installing the mother of pearl and the final result.