Skinning my CI App / Templating, styling questions

[eluser]CARP[/eluser]
Hi guys
This is my first question related to CI, and I'd like to know which would be the best way to stylize my App.
Is there anything I should see? Any recommendations for this? I've gone through the user guide but this topic isn't covered (or I didn't found)

I mean: how to structure css, my views, controllers, etc. and how to build the skeleton (look) of my CI app

Thanks a lot in advance for your suggestions