Did this the other day (Day of the Dead) on a friend to commemorate the passing of his dog Miles exactly one year ago. Not quite sure why the tattoo took so long (maybe cuz it's smack on the front of the shin) but I still have to finish the banner and bone sometime soon (he had to leave to go vote before the polls closed).
The waves and trillium flower in the skull are the "Humboldty" elements to give it a more personal touch...