For the first time in months (years?) I've released the monthly emitter library early! The easiest way to get the library if you're using pI3 for Windows is with the "check for updates" function in 3.0.2. (If you're not using the 3.0.2 update yet -- you should be.)
Perhaps not the most useful library, because I was in a "creative" mood, but some neat stuff I think. I was actually trying to get a "swirling mist" type of effect, but not sure if I got there. On the way, I came up with some nice looking emitters though.
What I've learned is that sometimes switching dark particles on a white background is a really cool look. Any emitters with thumbnails that use a white background should be used on white (at least try it).