User blog comment:GhostsSpector/Thinking out loud about CUUSOO/@comment-5671588-20130409013615/@comment-30610591-20130409015925

Sure it will definetly be a long time, but most of the famous ones (other than M rated or R rated stuff) have all ready been done. Sonic, Mario (*cries*), Doctor Who, Legend of Zelda, Portal, H.G. Wells time machine, Firefly, Star Trek, Star Wars, Lord of the Rings, Ghost Busters, Metroid, Back to the Future, Minecraft, Spiderman (and other superheroes), Transformers, Chronicles of Narnia, Tron, Teenage Mutant Ninja Turtles, etc.

Sure there are probably some I haven't mentioned, but that is the bulk of what I know. And I agree with your 2nd to last sentence. I'm just excited to see what people come up with once a lot of ideas from books and movies have already been put on.