Looking at the lineup, I think I’ve found a better image for Dooku.
I think the yellow really fits AOTC, as moercs has shown.
Textless:
http://i.imgur.com/PUCVPuG.jpg
How it looks in the lineup:
It isn’t quite as close-up as the others, but I don’t think it would work well that way since the chain is so important to his costume.
As for the colors, TPM-Red, AOTC-Yellow, ROTS-Purple (Mace’s Lightsaber), RO-Blue (The cold blue of Eadu), ANH-White, ESB-Black, ROTJ-Green (The natural color for ROTJ), TFA-Orange.