Mod the real-world
The Long Tail's Chris Anderson goes all fanboy on us and gets extremelly excited about hijacking 3D objects from our favourite games and then turning them into real objects. Now, most games will "let" you export 3D models without much hacking about and this is deffinetly 1337 but I don't know how good a lifesize low-polygon plastic BFG would feel like in your hands.