This could look lovely, I think. I'd be down with crafting 'em too. Perhaps a kind of jigsaw mini-game could be used in the crafting to assemble the pieces of glass (the edges where the leading (that is, the lead...or perhaps for us it would be "metalling") would go would delineate the puzzle pieces), and perhaps higher skills would unlock more complex and beautiful puzzle-windows to assemble.
Ooh. The more I think about this, the more excited I get.