A few nice photo contests images I found:
2008 Tree Farm Photo Contest
Image by Distant Hill Gardens
I submitted this photo to a Stihl chainsaw photo contest. I didn't win the contest, but the photo was used in the American Tree Farm System 2012 calendar. You can find out more about the American Tree Farm System at: www.treefarmsystem.org.
Note: This photo was used for the American Tree Farm System 2012 Calendar image for the month of June. It was also used in their marketing campaign for the 2012 Calendar.