I don't have anything terribly unusual, but I do have several fiberglass tanks with DIY windows I built in the late '80s. I also have a 750G fiberglass pond I picked up for $50 off craigslist.
The cylinder tank is from the Oregon Coast Aquarium.
I bought it from aquaticeco.com when they first started carrying them. According to their website, their popularity caused them to double the price of these tanks since I bought mine.