We need to be able to set blood color for individual dolls so there can be alien dolls with blue/green/yellow blood AND regular dolls in the same place.
Add a disease that is like poison except it spreads by touch, kills the doll instead of going away, maybe puts some kind of weird color thing on the doll, and has different particles than poison.
Add a disease that is like poison except it spreads to other ragdolls by touch. Also make frostfire and regular fire burn any object a burning object touches.
This should already happen.