When I go looking for images I need I often find cool things I never
expected to find. These images are all in the public domain:
I had a character in the Pandemonium tabloid news RPG who was a practicing phrenologist on the side. Given the absurdity of the setting it barely raised an eyebrow when the pseudoscience occasionally produced accurate results. Lot of fun roleplaying attempts to fondle the noggins of suspicious NPCs to get a good read on them.
That sound like fun. Thanks for sharing!