One important thing I forgot to suggest as a great way to make new particle images: use pI itself to make them!
For instance, there are some great spiky light blob looking emitters. Create a new project that is 256×256 or 512×512, add one of these emitters, then render the single frame you like best. Or create a sequence to import as an animated shape — but don’t get carried away on the number of frames.
Also. it’s important to make sure that the edges of your image are completely black (0,0,0). If you have even a very slight amount of color (1,1,1) then when this image is used it may result in hard/sharp edges where many of these particles overlap.
Alan.
………………..
Alan Lorence
Product Manager
GenArts, Inc.
http://www.genarts.com
http://www.wondertouch.com