Have you thought about 3D models? I read, that in 4.0 will be movie background enabled, but maybe you can organize to have it like Guitar Hero? (Sry, for the bad bad English. I'm German) And we don't have many good 3D modelers. Well, I could organize some ;) If you someone would code it, I would he...

Have you thought about 3D models? I read, that in 4.0 will be movie background enabled, but maybe you can organize to have it like Guitar Hero?
(Sry, for the bad bad English. I'm German)