Remember... we don't want him dead. He needs to stay alive and suffer.
Here's mine: (so far)
1. Castration with a blunt axe, then forcing him to eat his own severed testicles.
2. Sodomizing him with a white hot metal broom handle.
3. Blinding him with same.
4. Placing a bottomless cage on his groinal area, then placing a starving rat inside cage.
5. Hammering rusty nails into his skull.