I was watching Monsters Inc. the other day when i thought the part where there riding on the doors with Boo would be a really fun ride!!
You could travel into all different doors, experiencing different scenery, then it would turn into a roller coaster in the room where all the doors are stored!!
It's just an idea but with a bit of work, i think it could be realy good!!
There is a section for you're own Imagineering ideas here. (//http://www.photosmagiques.com/forum/viewforum.php?f=14) Good idea though :)
There's been rumours for a while that this kind of ride would be built at Disney's Hollywood Studios in Walt Disney World.
Plans have been shelved due to money was the last I heard.