I say go for all of them. You know you want to. And I'd give anything to replay the FS2 campaign with the Shivans green instead of red. And their weapons green included.
Hmm... This gives me idea to recolour everything. Green shivans and their weapons, white beam cannons and weapons for terrans. And Vasudans- dislike them, gonna leave yellow.
And what would we have red in FS2 then ? Sathanas, Ravana, a few fighters. Which wouldn't fit in red then.
And blue Shivans... hard even to imagine them like that.
P.S. One time I saw a video. Someone mis-typed the name Lucifer and typed it as 'Sucifer'. Immediate idea - pink Lucifer with rainbow coloured beams, and a red heart in front. Damn, it was such a disturbing thought...