My brother and sister-in-law commissioned a mosaic to be set into an existing window (it is long and narrow and looks out on the uninteresting view of another building). Instead of learning how to do stained glass in the traditional way, I used stained glass pieces to create a mosaic. I chose mostly transparent colors (instead of the more opaque ones I'm used to buying for the glass mosaics I do on boards) to better filter the light coming in the window. I purchased a wood frame and a piece of glass to fit inside it, and stuck the mosaic pieces onto the base glass piece. I experimented with different glues first; on board I generally use white glue (Weldbond), which dries clear (supposedly), but between two pieces of glass it takes forever to dry and is not 100 percent clear even then, so I used my trusty silicone adhesive, Lexel, which is messier to use but is clear from start to finish. The glass base allowed me to place my full-size template underneath, meaning that it was oh, so easy to follow the plan of my drawing! The photos show the template and two stages of completion. I grouted with a light gray, which I have found is best at receding into the background so the viewer is concentrating on the design itself. The window will be installed sometime in the next month, and I'm really excited to see it in place!