We need ways to automatically create and/or simplify graphics and sound for developers with little artistic ability.
For sound, one might use something like Microsoft Soundsmith where a developer with little music training can hum an original melody and have the software generate music based on that melody. For sound effects, one might use something like cfxr, but more sophisticated.
Graphics seem much harder to do when the developer has little artistic ability. Providing royalty free clip-art is a start, but we need to go further. Perhaps fractals and genetic art would help. More interesting would be software like this:
http://www.youtube.com/watch?v=e2H35SlLmUA
http://74.125.95.132/search?q=cache:Ki2DQ1aDgMQJ:www-ui.is.s.u-tokyo.ac.jp/~takeo/