Additive manufacturing/3D printing provides opportunities for interesting product development. One that we noticed recently was a 3D-printed microscope for a cell phone. Check it out here. You will also want to have a look at the 3D-printed aluminum jewelry at this link. While there, have a look at the custom-made aluminum guitars.
If you are into larger objects, how about a 3D-printed bridge? MX3D in Amsterdam is completing a 40-foot-long canal bridge printed from a stainless steel material. Check out the slideshow here to look at the progress and see its unique design.