A few of my ideas for a prequel trilogy rewrite.
Anakin was born and raised on the same planet where he fights Obi-Wan and gets burned by lava.
The Sith ruled the galaxy before the Republic. The Republic was founded by Force-sensitive slaves who overthrew their Sith masters.
Palpatine engineered the Clone Wars by secretly transferring cloning tech from a Republic agricultural planet to a warlike species in the Unknown Regions.