I guess it depends on each individual room. We stayed in a Cars suite for one night last Dec. It was really showing wear.
The back cushion on the blue and white couch was really broken down. It sagged a lot in the middle and would not fluff back up. The carpets were worn. The table was...
Not everything needs to be based on a movie/cartoon.
How about coming up with something totally new and creative specifically for the parks?
Then, if they are popular, maybe movies would be based on them years later ;) (ex. Pirates, Jungle Cruise, Haunted Mansion, etc).