Yes, Stan has a number of interesting clips he shows at the Cons when he has a panel.
There's the Space Usagi cartoon that was dropped, partly because of what happened with Bucky O Hare around that time.
There's some stuff from video games, including one that has Usagi kicking Leo's butt that had my group of friends giving me grief over for quite some time. (Hey! It was a staged combat to highlight Usagi only!

)
Obviously, the best Usagi looked on screen, is the new TMNT Toon.
A lot of the UY fans would love to see a Usagi-based cartoon, but as Stan said, he's not that active in working out such a thing. The Hollywood/tv-world is a pretty murky place to wade through. It's a wonder anything gets off the ground and onto the tv, when you hear people from comics talk about what did or did not happen with their stuff.