Hi, Mr Colt, and welcome to the forum!
My first suggestion is to look in the scale modeling hobby for accessories. Verlinden is one manufacturer that makes add-on sets to be used with model kits, to enhance their detail or to populate a diorama. Model company Tamiya has accessory sets to go with its line of WWII armor. There are others, too, smaller manufacturers. You'll find pieces made in styrene and in resin, or white metal.
Among the toy soldier and model figure makers, there were some who also made accessories to go with their figures. Phoenix Model Developments had an extensive line of pieces, and though Phoenix is out of business, the British distributor Forty-Third, Ltd, has most of their molds (if not all of them), and has many of their pieces available on their website (
http://www.forty-third.co.uk/index.htm). If you'd like to cast your own, Prins August has molds to cast some furniture and other pieces, intended for their Napoleonic line, but they'll fit most periods from the late 18th century through the present.
Another suggestion is to look in arts and craft stores, like Michael's, AC Moore or HobbyLobby, and in the hardware stores like Home Depot or Lowe's, or Walmart, when they put out seasonal displays. There are "scenic village" products available, many of which can be used with our figures.
And another source is the model railroad hobby, though you'll find differences in scale might limit the finished products that you could use. But there is a ton of supplies that model railroad hobbyists use, that can be used for diorama building.
Hope that helps!
Brad
