Recently I've participated in CG Society's Shading and Lighting challenge.

CG Society's Lighting Challenge #25 - Artistry -
http://forums.cgsociety.org/showthread.php?f=185&t=935462

Models done by: Giorgio Luciano

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CG Society's Lighting Challenge #24 - The Cabin -
http://forums.cgsociety.org/showthread.php?f=185&t=911008&page=1&pp=15

Models done by: Andrew Kin Fun Chan and Dan Konieczka.