We have seen hundreds of interesting 3D printed accessories for the iPhone from cases and clips to mounts and amplifiers.  Lab02 have designed a really sweet rande of lightclips for the iPhone.

3D printed Ghost iPhone

The Lightclip was designed specifically for 3D printing
in White Strong and Flexible (Nylon). This material is very strong (obviously),
affordable and an excellent light diffuser. The Lightclip
emits a beautiful ambient light, which is evenly distributed and very
easy on the eyes. Use it as a nightlight, at a camping trip or when in
need of a superhero!