Try
www.designtoscano.com for decor items. Another solid company is
www.eleganza.com . I have been noticing that there are some excellent reproductions showing up on the market now in resin, mostly from China - much better than what I have seen from Eastern Europe. These have outstanding quality and detail and are more durable than plaster.
Gary is right about lighting. You will find a room which will change personality with different lighting, different times of the day - this is the appeal of three dimensional decor, including ornamental plaster. I would recommend you contact a plasterer because a good one can: make wall niches for displaying objects, add moldings which will give the visual effect of the room being taller or wider than it actually is, and you can also get that beautiful, flat finish of a plaster wall.