I have been using a pearl inlay of the planet Jupiter, with its characteristic red spot, as my headstock logo. It is distinctive, attractive, and relatively easy to make and inlay. The process is as follows:
First, one gets out a number of different colors of pearl, each of which is big enough to fit the entire logo.
I print out multiple copes of the logo from my computer, and glue these onto the pearl plates with rubber cement. I then cut out the logo to yield a series of circles/planets/logos each of which is identical other than the color of the pearl.
With a fine saw (jewelers 5/0 ) I then carefully cut all the ‘bands’, and cut out the hole for the red spot. I keep all the bands from a single piece of pearl together. When I am all done with 4 or 5 single color logos, I then mix the bands by selecting alternately from each of the single color logos which I have cut out. The pieces, since they are all cut from the same pattern, fit together pretty well though some cleanup and adjustment with a fine jewelers file is always required. When the pieces are all fit together I put them on a piece of wax paper and drop on medium-thin CA glue to glue the logo together. When the glue has hardened I clean up the red-spot hole, use the hole as a pattern to cut the red spot out of recon stone, and then glue it in with CA glue. As a final step the edge is filed smooth and the whole thing is sanded front and back to yield an even flat logo.
Any remaining voids between the bands will be filled with CA glue when the logo is actually inlayed. The inlay process is simple, because the logo is just a circle (or nearly so), so it is an easy cut-out.