sigh, I want them. I'd just hang on one of my walls as art. Are you close enough for me to drive and get one ? :))
Since you didn't give dimensions it's difficult to give you ideas but here are a couple of general ones:
Green house, small on stand. You can google greenhouses out of windows for lots of ideas.
Make a screen...3 of them hinged together, add regular windows to the bottom to make them taller if they need to be taller.
Make into a mirror. Make into coat/hat rack. Again it would help if we knew what size they were.

furniture: headboard; chair or couch back; tabletop, using two together with the flat bottoms touching, then glass on top.

gazebo or garden house walls. Or hang from porch roof.

I want them, too!

depending on size you can hang them from a porch ceiling between the ceiling and the railings, make sense? I do this on my front porch with old windows and glass paint - looks awesome and people ask where I get them :-) should start selling....like I need another project lol. I also hang or stand same "stained glass windows" on lower interior windows for a privacy screen. light still comes in and privacy is good. love it cause I can change with the decor