spongebob... and in 2004, i think my dream might come true
they already had movies, but I don't think any went into the theater... the peanuts gang!
edited: i think i misunderstood the question. are these cartoons you want to see live action in a film or just cartoons in general? If live action, then definitely the peanuts gang. spongebob would be good too, but i don't think live action would work.