I love clever art, especially when that art has a deeper meaning... literally and figuratively. Check out Japanese artist Takayuki Hori's X-ray animal origami:
Pictures of the animal bones are printed on transparent paper, so when assembled you get a complete skeleton. They're beautiful and a bit eerie... and the message the artist is conveying is about pollution in Japan that is threatening and killing wildlife there.
Tip o' the lead apron to Geekologie.