The orange saber works pretty well with Dooku.
On another note, a little detail I think would make a nice addition in ROTS would be for Anakin’s eyes to be yellow in the shot of him brooding on Mustafar.
Although I’ve kind of felt the “Sith eyes” were a cheap way to show when someone is consumed by the dark side, I think it is sort of necessary to visualize what the Sith, and Anakin in this instance, are feeling. I think having a little extra moment of Ananin visibly consumed by the dark side could help justify Anakin’s actions and personality later when he is with Padme and Obi-Wan. He finally understands the power of the dark side, which is why he seems so confident in his “new powers”. Sidious even tells Anakin that only after he has killed all of the Jedi, and eventually the separatist leaders, that he would be strong enough to save Padme. Just a thought though.