I just came upon this really interesting site called Cartoon Solutions that sells pre-designed animated cartoon characters and backgrounds for inclusion in Flash applications. The site’s wealth is in the various characters that are for sale, ranging in price from $12 to $24 for a fully animated and walking character. The characters vary by name including “Ninja”, “Katie” and “Zornac the Alien”.
There are a number of scenes which are featured backgrounds all cut up into symbols and ready to animate. The backgrounds include a basketball court, home plate, office scenes and an Evil Lair… just to name a few.
The site also offers video training packs for learning how to draw and animate in Flash. These are not for the serious developers out there, but I bet they could add some fun to something you are designing in Flash CS3.