I'm sorry if this has been posted before. I think it's pretty cool and well done.
http://www.nintendowiifanboy.com/2008/02/21/what-if-super-mario-galaxy-was-on-the-snes/
This one is also pretty nice :)
http://www.gametrailers.com/player/usermovies/177826.html
Couldnt link directly to them :P
Beware, I live!
I am Sinistar!
Beware, coward!
I hunger!
Roaaaaaaaaaar!