Floating dust particles might be the new lens flares, they do seem to add so much more life to a scene. On that note Joel Otron shows off his freely available MicroFloaties Rig for Cinema 4D based on clones and effectors and some xpresso. The MicroFloaties Rig for Cinema 4D will allow you to quickly add floating dust particles to your scene, and control the amount, size and speed of the dust particles as well as the scale of the area that they occupy.
Check out the post on the Microfloaties Rig for Cinema 4D here.

“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.”