I recently worked on John Ks (you know... the Ren & Stimpy's genius creator!!)
Miley Cyrus stage animation.
I designed and animated the grey robot character.
Johns direction was for the character to look big and scary with a face similar to 1920's actor Louis Wolheim....
...And this is what I came up with.... (below)
It was also the first animation I did on my brand new spankin Cintiq 13HD which I can't recommend enough.
A portable light weight cintiq is definitely the way to go!
You can see the full animation below.
You can read more about it on John K's offical blog here