The buildings are dressed up with vertical elements like buttresses (pieces cut from blue foam wall insulation--cheap), small pipes running up the walls (plastic model sprue--free!) and free-standing 'vaporators and antenna units placed on the roofs or in the adjacent streets (pieces of household trash decorated with plastic sprue bits and scrap wires, based on various sized steel washers--darn cheap).
I am working on some partially ruined buildings, with foamcore walls based on foamcore foundations piled with rubble made from all the bits of foam and plastic left over from other projects. Since some interior walls are showing, I am decorating those with additional high-tech vertical and horizontal conduits (plastic sprues) and raised panels of various sizes and shapes (cut up scraps of cardboard and plastic card). The interiors will be painted mostly grey, to contrast with the tan exteriors. The biggest expenses here really are the foamcore scraps (which I already had on hand), the white glue, and replacement knife blades (foamcore eats razors and #11 hobby blades for lunch).
Back to my Star Wars Tabletop Terrain page.