The newest shot looks amazing! Really think the un-reversed shot of the kids works best.

Concerning the color of the light saber. I am color blind and the blue light saber will surely stand out more than a green (or even red for that matter) a green will sort of fade into the background.
I also like to think that these aliens have not seen a light saber before, they have only heard about it, and in their view a light saber simply is blue.

Anyway, just have to say, you guys are awesome!