I found this website today and thought I'd share.  It's really neat skull carvings.  I particularly like the agate/amethyst skull.

https://www.skullis.com/

I have been meaning to post this for a long time, so I am dredging this thread up. 
So how about this "skull"? It is a little bit bigger than a nickel.
I found it in a creek that I find quite a bit of artifacts, along with jasper and agate, here in East Tennessee. The creek feeds into the Clinch River.
It freaked me out for a few days and almost made me stop hunting altogether thinking about how you might find things you may not want to. You know, like a fertility object or something like that.

I think it looks like a young neolithic lad with a crop of hair on his head and a big smirk. Clean the sand out of his eyes and brush his teeth and he might be kindof cute, in an adolescent goofy sort of way.