I like the idea of everyone having blue sabers, including Windu.
I feel there were some missed opportunities with Dooku’s being more of a rogue figure, when it’s instantly squashed at the end of AOTC that he’s pretty much just a follower of Palpatine. If one could make him seem more of a rogue, I think it would interesting to see him with a white blade or at least silver. Colourless, and unaffiliated.