Our door has a stained glass panel (bought that way). It has plain glass on each side.

We have a stained glass window that my husband made for our bathroom. When the hubby installs it he is going to put clear glass on both sides of it, insulating the stained glass between the 2 panes of glass.

Wow, what beautiful colors! I installed a piece of art glass for a client. They had a plain, new, insulated bathroom window. I cut the piece of decorative art glass (one solid piece, no cuts, just one piece of seeded streaky glass) a tiny bit smaller all the way around. I installed it with GE Silicone Clear II, first running a thin bead all the way around, pressing the cut piece of glass onto it, waiting for it to set up, then running another thin bead all the way around, smoothing it with my finger, and it has held up now in their shower area for awhile.