Another item in the telephony department...this is not an actual item, but a kit that can transform a regular iPhone to a transparent one. Sadly, it doesn't make the whole thing transparent, but the back-plate becomes a window into the phone's SOUL...

http://www.ifixit.com/iPhone-Parts/iPhone-4-Revelation-Kit-GSM-ATT/IF182-021

 

Here are other similar kits:

http://cellpartsdirect.com/clear-white-lcd-kit-iphone-4-gsm.html?___store=default

 

http://iphone4parts.com/shop/att-iphone-transparent-glass-back-cover-baby-blue-p-603.html