That's funny, I'm planning to do one of those, too. The photos I am going to use are:
-Hidden Mickeys on the bedspread, carpeting, and in the painting on the hotel room wall (we stayed at YC).
-the elevator buttons that you push to call the elevator (as opposed to the ones inside the elevator) were pictures of ship steering wheels, so I took a photo of that, too.
-Boma presented me with a cookie and candy platter for my birthday dessert, and there was chocolate drizzled on it in the shape of a Mickey head, so I took that photo.
That's all I can think of off the top of my head. You may not have these specific items, but it might help you to look in places you wouldn't have otherwise.
Good luck!