- Make sure your work is your own. If derived from somebody else's emitter and you haven't made significant changes to it (it appears visually the same or similar), you should at the very least credit that person.
- Do not share emitters that you have purchased. There are some emitter sets that are not free, and of course you cannot give those away.
- Do not sell emitters that are not your own work, or are visually the same or very similar to emitters that were not your own work.
Other than that, please do share. pIllusion users are always looking for new emitters, and I especially like to see what other people are doing with pIllusion as it inspires me to create different emitters every month. Starting with somebody else's emitter is one of the best ways to come up with something completely different.