I'm going through old photos and sorting them... and I've found something I meant to document...
Here we added a blood splatter effect to a foam prop.
Step 1: Load and Fire
Load paint into your water bottle rocket launcher.
Aim at your shirt, prop, etc.
Fire -- I found a good distance of 3-4 feet
Very simple - but it gives a "random" pattern in a localized area. Just a little tip for next season ;)