Have you seen Erin Hill’s stuff? I don’t think it could be classified as rock (maybe poppy rock mixed with a bit of jazzy bluesy stuff???) but it is very neat. She does original sci-fi songs. Stun and Silver Feet are my particular favorites.She does not have those up on youtube, only on her myspace account but here is one from youtube. I have to say if you like funky xmas music you MUST listen to Silver Feet. Nothing like reindeer in kevlar suits.
http://www.youtube.com/watch?v=lyPP5G4lbwY