I thought Anakin would have a father.
After Episode I, I thought that Anakin would return and find that his mother had died, which would begin his turn to the darkside. The way I wanted it, though, would be that Watto had somehow killed her, either through negligence or general slave owning abuse, and Anakin would then kill Watto. Killing him would shame him and devastate him, but it would also open the floodgates of his strength. I got that one pretty close.
At this point, I picture Padme being pregnant and Anakin somehow thinking that she has been killed (or her actually being killed) and assuming the twins are dead as well. Then he rushes off in a rage to confront whoever he's blaming, and spends the next however many years of his life thinking they're all dead, only to discover in the Death Star trench...
I did a lot more thinking, but those are still on the top of my head...
Oh, and a side note about Tatooine...it's supposed to be this non-republic, inconsequential ball of dirt far from the center of the galaxy. How come Naboo just happens to be next to it, and the start of the Empire? How come the rebellion is flying right by some ball of dirt far from anything else important when it is overtaken in episode 4? It just seems a little too involved for me; it comes up in every storyline and every game...