They changed all of the lights in the chandeliers to green. Also all of the Christmas trees were decorated in green lights and ornaments....in reference to the Emerald City.
If you have not been to see Wicked, what are you waiting for??? It is the best thing I have seen on a stage. I have seen it three times, including once on Broadway. The two girl leads in the show I saw yesterday in Detroit were the best, including the girls in the Broadway show. Go see it! It is here at least another week. If you can't get there, at least you can see my illegal picture of the dragon over the stage. I took this right before I got in trouble for taking a picture.