FGY Architects Beautiful, aren't they? Alas, like many of the fixtures in this house, these are one of a kind. The fixtures themselves are very old, found in Europe and brought back, rewired and relamped. We did a quick scan for some other manufactured fixtures that are like this and didn't see any immediately. You can have fixtures custom made of course, but they will typically cost more. If you are interested, you might try contacting http://www.hammerton.com/ and many others do custom fixtures, too.
FGY Architects On these types of projects we often will use plaster but on this particular house we wanted an ever more rustic texture and used stucco.