My son's new superhero bedroom I just did. I got the wall decals from wallstickeroutlet.com. After painting the walls I used painters tape to tape off the city scape. I free handed the windows with a small paint brush and a sample size yellow paint from Lowe's (color was candlelight or something like that) and randomly painted the windows. I had so much fun doing this and it has such a huge impact for for the price. $50 in paint with some left over for other projects & $60 for 3 decals.