If you put some useless items in the Recycler and apply power to it, it will produce some scrap.
Scrap can be used to craft Scrap Boxes, which contain random items. It is surprisingly flamable and can be burnt in a Generator for 870 total EU. Alternatively, scrap can be placed in a Mass Fabricator to amplify the fabrication process, making it six times more efficient!
These recipes are shapeless.