I'm trying to figure out the Particle Instance modifier and how it functions, but as yet have had little success. I'd greatly appreciate it if somebody could give me a rundown on its functions and how to use it.
This modifier allows FX but works only with another object that has a particle system. An example:
Add a cube and give it a particle system with Hair,
Add a UV sphere and apply particle instance to it,
Now, in Particle Instance, select the cube in the object field.
In Particle System experiment with hair length.
Try out all options.