WDW is in NEED of some kind of Nightmare Before Christmas attraction/show
so here are my ideas
HAUNTED MANSION HOLIDAY!!!. It would be great to se Jack Skellington and his crew take over the Mansion at MK. Plus they can add new scenes where the Library and Piano are. And maybe some other Nightmare Before Christmas theming around Liberty Square.
At Hollywood Studios, why not build a Nightmare dark ride (full time) where the old Hunchback of Noter Dame show was. It could have a trackless ride system like pooh's Hunny Hunt.