It turns out I had another stained glass project in me after all. I just couldn't resist the heady contrasts of strength and fragility, profanity and sanctity. Plus, it used up a lot of random pieces of leftover glass!
@attoparsec is it true many (most?) stained glass windows use lead in between the shards?
@book Yes, either in the form of extruded channels or, more commonly these days, soldered directly to the glass, after applying copper foil tape around all the edges.

@attoparsec Soldered direct to glass?

Woah... I would've guessed the glass to shatter!