Here's the Particle Emitter created for my animation "The Italian Cult of Coffee". Vimeo Link:
It is an Emitter of butterflies swarm.
I used images of a very common butterfly, Pieris Napis. The plugin has the settings I used in animation, but I added an attachment with an example of a different setting to show that it is possible to easily obtain other combinations.
First of all, you need to install the emitter : Unzip the attachment and put the Folder “Pielle Emitters” in User / Your name / Library / Application Support / Motion / Library / Particle Emitters. now you can use the Emitter "Butterflies Swarm" or double click on the attached file "Swarm example" and study one of the possible implementations.
Have a good fun Pielle.