astromech said:

Take a look at the excellent Returning to Jedi documentary, you will notice footage of Luke during the sail barge scene with a blue lightsaber...

You can also just look at the original poster. It had Luke with a blue saber. I posted a link a few posts back of a video with Luke with a blue saber in the second duel with Vader. Whoever did it is not the greatest, but it is still interesting to see.

We also have the opprotunity to change the colors of a force ghost. Does anyone else think it is weird that both force ghosts and holograms are both blue? Kind of confusing for kids.