Well, for starters I'd like it if somebody did Ella Enchanted properly

Terry Pratchett's books would be awesome, or maybe it'd be better to make like this discworld tv series, focus on each of the books for maybe like three or four eps... Then Jane Austen's Sanditon (well, somebody else finished it but it was still good). Then better adaptations of Jurassic Park and Lost World, those books are actually pretty good, you'd just need to add some emotion in them. Danger Girl the comic book might make a kick ass movie too. Then there's this book, I think it's called Lives of the Monster Dogs or something, it was cool but it might be kinda hard to make...