Blue lightsabers are a reasonable idea. Also, in keeping with the idea that the Jedi were protectors from a more idealized time, I imagine they would have been more like Samurai than soldiers. For example, many would be in service to the reigning monarchs of the frontier worlds like the King of Alderaan, and these were the only ones known as Knights as opposed to people like Yoda who were always unaffiliated teachers and mentors. These Jedi Knights would wear black like Luke in ROTJ.
The Damn Fool Idealistic Crusade of the Jedi may be where people like Obi-wan, Jedi Knights under the command of the King of Alderaan, wish to band together to fight the clones and it may have been their idea to turn the Chancellor of the Old Republic into an Emperor in order to bring the Jedi together. Then, when the Jedi Knights begin to realize the error of their ways, Anakin is secretly tasked by his Emperor with hunting down defectors from the new Order and terminating them.