I always thought it would be cool to take familiar characters and themes and incorporate into a single game. A horizontal shooter would be my preference, ala Parodius. Or an adventure game ala Zelda where you could interact with various familiar (or not) Amiga characters. Rick Dangerous, Shadow of the Beast, people from Body Blows, Superfrog, etc.
'Course, any effort which was totally original featuring hand drawn artwork and music from us here at A.org would be awesome
