Here is a tutorial for my Microfloaties rig. Microfloaties is a FREE tool for Cinema 4D that lets you quickly add floating dust particles to your scene. It's a rig fashioned from some of the mograph tools (cloners and effectors), some xpresso, and given specific user data to control the amount, size and speed of the dust particles, as well as the scale of the area they occupy in your scene file. Microfloaties requires Cinema 4D R12 Studio. You will need to have the mograph module and dynamics for Microfloaties to work properly.
Special thanks to C4D-ers Dominic Faraway and Brett Morris for their feedback and assistance.
You can grab it from my blog: wp.me/pO9t4-bR