Last time I was in PAris I saw a man cutting black paper into the silhouette of tourists, he was doing it all free hand, whithout anythin other than his eyes, amazing!
Other than that, I remember doing one when I was in kindergarten, we had to sit with a briht lamp next to us and the teacher would draw out our shape on a white paper nailed to the wall. We had to paint it afterwards and give it to our parents ^^ Not sure this is what you're looking for as it ends up much bigger than the original size.