I wouldn't mind seeing a movie about Yoda, since there is so much to tell about him and it would be possible to make a movie of him without touching on existing EU material and stuff from the movies. The deleted Dagobah scene from ROTS could be used near the end... But I have a feeling that he would lose too much of his mystery and the movie would be badly done.

I wouldn't mind something from between the Old Republic Era and the PT since it isn't touched on much in the Star Wars universe.

I would find it really interesting if a story of one of the background characters was made into a movie and included a shot from one of the existing movies (not an identical shot of course, but one from their perspective). This could be someone in the cantina in ANH, one of the podracers, a rebel, or pretty much anybody.

The story of the Millennium Falcon could make a good movie, aside from the fact that it is already in novel form and not a bad novel either.

I almost wish we just ended up with several stand-alone films and nothing directly related to the other six movies. Too many loose ends were tied up in ROTJ for the next three movies to tie in well.