I was experimenting with creating smoke with Mir. It's basically two blurred layers of mir with slightly different settings. Added some dust with Particular too. It's not perfect but pretty cool. The comp was made so it can be extended to any duration (uses no keyframes, just time-based expressions).
Download project file (AE CS6 or later): MirSmoke_CS6.aep
Download AE project file from here.
Note: I had to disable the Lens Flare layer on my computer since it didn't have the plug-in for that. Otherwise it'd just render grey.
It's a beautiful effect! And the project is neatly setup and renders quickly.
This is the "Bubbley HiComplex" comp that uses the Multi SmoothRidge type. Here used with the Seamless Looping functionality to create this ever-looping GIF.
"Oil Flow" - same as above but with specular and almost no diffuse.
Here is the SmoothRidge fractal type lit with a few lights and Material properties setup so there is almost no diffuse and lots of specular. Lux also used here to visualize the lightsources.
Also included is another test with the technique from the Mir Thing tutorial.
If you want to check them out here is the AE project (CS6): mir_beta3_stuff.aep
You'll need Mir v2 beta 3 to render correctly.
There's a couple more comps in there too. Let me know what you think in the comments!