To make the glass i took a transparent paper, a blue paper for the windows and a white paper for the doors, the paper should be thin and not opaque, if you hold it in front of light you should kinda see the light through it, the color of the paper that you choose is going to be the color of the light of the building so i recommend using pastel colors like blue, pink, violet or white because these colors are relaxing and very pretty to look at, avoid using red, green, orange, yellow. I placed the papers on top of the windows, measured how much i need to cover the windows and the doors then i cut the excess with scissors. The transparent paper should cover all the windows and the doors, the blue paper should cover only the windows and the white paper should cover only the doors.