Cool idea, impractical application
This app definitely does what it claims, but its an impractical application of the idea. The real problem is the camera and the cameras perspective. Sitting in a dock, etc. -- unless set with plenty of space between device and background -- the image behind the clock will likely be blurred, or just a different enough perspective to break the "see-through" illusion, or just uninteresting. Neat idea... but save your 99¢.
afluke about
Chameleon Clock