I know these are made more miniature RPG's and are based off a 1 inch scale, but I'm sure they'd be great for making backgrounds for displays. They are alittle expensive due to needing the mold ($29-$34+s&h), and the plaster (plaster of paris is cheap, but some of the dental plaster can get $$$). Basically it's a mold for blocks that you can glue together to make things out of. Mostly used for miniature gaming like D&D. I have some of the Gothic and Fieldstone molds, but haven't gotten into the Sci-Fi molds, yet. Think about making your own Lego, as many as you need. The molds are super durable, mine are 7+ years old and good as new. I thought someone might be interested in them. Hirst Arts Mold Page Home page for Hirst Arts: www.hirstarts.com Also has a ton of tutorials and tips and tricks for scenery.