Style Secret: Heavy MetalIf there's a go-to industrial material, it's metal. Tin, steel, iron and aluminum create a clean, cool, functional sensibility and lend just the right touch of sleekness without feeling too upscale. Anything that can be forged or welded is fair game: exposed ductwork, stairwells, countertops, divider walls. Smart strategy: Choose "cold" metals (not gold or brass) that have a matte finish or a kiss of patina. Industrial style is not about shine and sparkle — save that for your jewelry. And break up all the metal with other materials, such as wood or stone, to keep from feeling as though you live in a factory (unless, of course, that's what you want).