Junk metal sculptures are common art projects, both among professional and amateur artists. Several post-war sculptors like Mark di Suvero create large-scale works by assembling factory-made metal objects into elegant and abstract compositions.
Junk metal sculptures are fun projects for anybody, as demonstrated by an Illinois high school whose students made a junk metal version of the famed disco band the Village People.
Often thrown away once they're obsolete, old metal computer parts are plentiful and frequently turned into art objects. Several junk artists, like Mario Calcedo Langer, create toys and animal figures by joining together junk computer parts--in one of Langer's works, for example, a computer mouse becomes the body of a scorpion and metal clips and wires become pincers.
Junk metal is also an attractive material for yard objects like birdhouses. It doesn't matter if the yard decoration gets worn and rusty--after all, junk metal is already old and rusty. You can make a birdhouse out of an old gas can. Screw on a roof of flat metal plates. Old ceiling tiles are another attractive option.