I'd like to present the most complex KRI technology - fur module.
In short: exploiting the existent GPU particle module plus geometry shaders allows to model & render the fur in a standard way: pure geometry.
First, I've made an article about the system (in 3 parts), where you can find the most detailed description of how it works. You can see it right on the title www.gamedev.net page. For those lazy ones providing the direct link:
There is also a new video about fur on KRI channel: