Yes. Go buy a copy of Mysteries of the Sith and you get a very nice Darth Vader and Luke (from ESB) skin for use in Multiplayer.
You can also use Luke in the Bespin Secret Level for MOTS.
If that's not your bag, you can always check out Al MacDonald's website, where he has some cool Vader/Luke skins:
[This message has been edited by Kurgan (edited July 20, 2000).]