About two months ago Wayne Fredrickson of Zodiac Tattoo Studio in Moreno Valley, CA did this scar of an ammonite fossil. I like the way the design leaves out the edges of the shell, but instead focuses on the texture of the shell. The resultant effect reminds me of a textural rubbing of a fossil, and seems especially well suited to the scarification artform.
In terms of building up a tactile texture landscape, I’m also reminded of this scar that Iestyn of London’s Divine Canvas (divine-canvas.com). It’s about four years old in this photo.