For Text:
you need to create an image of your text in a program like Photoshop.
Just make sure it the size of the image is in multiples of 16 – i.e. 128×256, 32×256 (or any variation).
Make the letters white, and the BG black, and save as a Tiff or TGA.
Then in the emitter properties go to the Change shape tab and then import the image (via one of the “Import Image…” buttons).
For more on this, just check out the pIllusion help files: Tutorial 3: “Particle Shapes”
Regarding BG footage:
Check out this Tutorial. it will explain how to use BG footage. Only thing to remember is that in the tutorial it’s a still image, but otherwise it works almost exactly the same:
https://www.wondertouch.com/tutorials/aharon/basic/Tut_1.htm
Aharon Rabinowitz
arabinowitz(AT)yahoo(DOT)com
http://www.allbetsareoff.com
http://www.pIllusionFusion.com