On my way to starting a new project, I came across this.
https://vimeo.com/78652546
It's just a play blast, but I thought I'd share. It's just a simple particle emission, but the way it flowed had me staring it at it until I realized that the time slider hit almost 2500 frames. It's super easy to set up, using only two particle systems and a turbulence field, but I just found this hard to look away from. I just had to share it.
Enjoy!