First I spray painted the outside of the boxes black:
Then I folded all of them up. I found these great foam space stickers from Michaels. Then on Open House Night (Meet The Teacher Night) I let the kiddos pick 4-6 big stickers and 2-3 small stickers to put around the outside of their box. (While they decorated I was able to talk to parents!!)
You can see through my example but the rest of the boxes are completely covered. (I just was running out of paint and didn't want to get more for only 1 box.)
The kids had a lot of fun with this.
Do you have any other activities you do at Open House? I would love to hear them!