I played a blue female Twi'lek Shadow. The main reason was years ago I ran a Star Wars tabletop RPG and my wife played a blue female Twi'lek. Although she was a soldier and not a jedi I decided to recreate her for my first playthrough. Well, first full playthrough. I started with a human female on a F2P account, then after subscribing I started over using my experience to create a better experience. I plan on completing all Classes and using a different race for each class.
On the PTS I have a red female Twi'lek Assassin. I doubt I'll complete the story on the PTS so I just picked this without much thought, even though Twi'leks seem to be a good choice for a slave.