well patches are difficult to export for the granular bits of Absynth, because of the samples involved.
Basically, it just replaces an oscillator with a granular sampler, and then you control the nature of the oscillator sound with the density length and random pitch controls.
You may also want to try out KTgranulator which is an insert effect (free) and can really mash up sound.
There are some very nice reaktor 4 patches out there on the user database. Particularly laserbrew, which i suspect i granular in origin.