You should use black for the wall paper with gold stars. Posters of the casts every where too. Pictures of the starships. and some planets. Your son will love it.
I would use dark blue, light blue and white. I am assuming this is for a elementary or preschool boy. One cool thing to do would be to paint one whole wall in dark blue or even black and make light streaks like you see when they jump to hyperspace. There are lots of discounted Star Wars toys out there for inspiration or decoration. Posters will be less permanent than a lot of painting, depending on how much or little you want to put into it.
Of course, if your boy is a Darth Vader fan, black and red would be the way to go. Have fun and post us some photos when it is completed.
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