Cool stuff that I’d like to see done:
-Grievous with Maul’s eyes
-The emperor in ROTS being thinner in the face (less puffy) and less purple. Sort of like Aalenfae’s version: https://vimeo.com/31342993
-Finish the deleted scene where Anakin kills a Jedi, rather than a bunch of kids
-Using the deleted scene in ROTS where Grievous kills Shaak-Ti, make a hologram of that rather than an encounter, this would be Maul/Grievous’ re-introduction, he sends the Jedi a hologram/recording of him killing a Jedi knight.
-This one would be quite tedious, but in the scene where Windu and other Jedi confront Palpatine, it would be cool to see the other Jedi float into the air and get force choked by Palpatine rather than have them stupidly and awkwardly killed in a lightsaber battle, this would make Palpatine seem way more powerful and make the scene much more intense.
-Show the “Republic cruiser” from the opening of TPM firing lasers inside the droid control ship and escaping, just like Anakin did except this time it would be Obi-Wan inside the cruiser rather than Anakin inside a Naboo starfighter

Some of this would be quite complicated and tedious, but I think these could be much better movies with these changes.