I cosplayed as Chris Chan at a sci-fi convention in Stockholm and made this Sonichu medallion for it.
And if you wonder then the answer is NO, it's not made of Crayola "FUCKING" Model Magic.
It's made of salt dough and colored with acrylic paint.

I decided to make it a bit different because most people that makes this medallion follows the same design.

Christopher Lloyd was signing autographs at the convention and when he saw me he said "Oh...hello!" with a surprised face.