I love Julius!
1
Download a picture of Julius (or Clancy or whoever you want) of the internet.
2
In photoshop, resize it. 2.5 x the size you want usually works for me. So if I want a 2cm/0.8" keychain I make it 5cm/2". Print the resized picture.
3
Trace the picture on the shrink plastic.
4
Color this in.
5
Punch a hole in the top of the head.
6
Cut it out.
7
Bake it in the oven according to the packaging of the shrink plastic.
8
Put a keyring through the hole.