I've got no idea if it's old or new, but I love this stained glass window above one of the shop doors on Nithsdale Road in the Strathbungo area of Glasgow.
Love these stained glass windows on one of David Barclay's 1900 townhouses in the Dowanhill area of Glasgow, especially the apparently smiling fish-like faces in the lower sections.
This gorgeous stained glass window is on the French Gothic style Church of Saint Jude's Congregation on Woodlands Road in Glasgow. It was designed by John Burnet Senior and was built in the 1870s.
Love this stained glass on Ross's Original Bar on Mitchell Street in Glasgow. It's housed in Gordon Chambers which was designed by Burnet, Boston and Carruthers. It was built in 1905 and I presume this is also when the stained glass dates from.
This beautiful stained glass window is set into the door of 29 Bute Gardens, a Glasgow Style townhouse created in 1907 by John Nisbet. The shape of it is unlike anything else I've seen in the city.