Octorox said:
For inspiration in the area of Grevious:
http://www.youtube.com/watch?v=-1IVhMp2WPk
I always loved the way the original Clone Wars presented him as an absolute badass Jedi killing machine, more of a monster or weapon than the chatty moustache-twirling villain he is in EpIII
You have to conciously work to mess something like this up. It's all there, yet we still got a silly cartoony (more cartoony than the actual cartoon one!) version of Grievous instead.