Way back when, Suz posted some mock-up fake sets from a hypothetical Disneyland theme:Suz's Lugnet post
A quick Brickshelf search shows there have been several great MOCs:SALUG Disneyland layouttrain stationPirates of the Caribbeanrestaurant inside the PotCSleeping Beauty castleanother SB castleCinderella castle
Such a theme could be really cool if done well.* Great chance for cross-promotion with one of the best sales-machines out there, plus sales at the Disney stores and in the parks. There is already some sort of relationship because there are big LEGO Imagination Centers outside of both Disney parks in the US (no idea about Euro and Tokyo), plus I know they used to sell all of the LEGO Star Wars sets in the shop you enter when you leave the Star Tours ride at Disneyland. Those signature rides at Disneyland are decades old, so this is not a flash in the pan idea like many licensed themes. They could even revive the old Duplo Winnie the Pooh and system Mickey and Minnie molds for costumed characters in the parks.
Anyway, mouse ears would be a natural addition in such a theme.
*Wow, can't believe I'm writing one of the "LEGO should make a _____ theme" posts.