I added a puzzle effect on a photo of myself, printed it and colored some of the pieces black. I took a photo of my of my own photo, and here is that result.
Post process:
Raw, fixed WB and saturation.
Opened it in cs3
Soft light with a high pass filter
Color Dodge
Merge
8-bit and saved.
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"You may include existing images or artwork as part of your composition as long as the entry does not appear to consist entirely of a pre-existing photograph in order to circumvent date or editing rules or fool the voters into thinking you actually captured the original photograph."
This is hard to see for me. I think perhaps larger puzzle pieces wouldn't make it so difficult to make out. Also, perhaps a lighter background (white instead of black?). It might be cool to see the light coming through the pieces.