I have check over many sites, and I have only found one effect tut. But it was down at chaosgfx which is down
The most common/overused way is to create a primitive object, make it editable, and then use matrix extrude. Add a transparent material, and you've got a generic 3D abstract. If you want an in-depth tutorial search C4D-tut in deviant art. There are thousands of the things there.