What do you do when you have a super ugly window that you don't use? This one was covered over on the inside to create a sound proof music room. You can see the foam glued to the other side. Super ugly. I (of course) opted to mosaic over it. With some clear silicone based adhesive I attached my swatches of stained glass mosaic that I had a few days before glued to fiberglass mesh. You can do this too! I was a little surprised how easy this was. I made 4 swatches about 19" x 15" and then filled in around the mounted swatches.