I was practicing my skils, recently, working with a silicone.
I took my old "skull" chain:
Took of one of the skulls, cut of the part I didn't want to have, and prepered it:
Than I covered it with silicone, and left for a few days. Than covered it with a gypsum, so that silicon form will stay in place while I'm using it.
Finaly, I've just mixed a gypsum, poured it in a form and left it for a few minutes until it hardened. At the next day it becomes fully dry.
It takes me about five minutes to make one skull.
I want to make about hundred of them and glue them on the streets, in the busses and every where.