Finally, the mod that you've all been dying to see is here! I introduce to you:
Darth Nihilus is cool and all, but why just be cool when you can be totally bad@$$ and have a smiley face for a head!
This mod changes the in game model and the main menu model of this pansy Sith lord. Both models are different and I didn't take the time to make their faces exactly alike.
If you are brave enough to handle this awesomeness download this rar
or this zip
or from KOTORFiles