I'm not a photographer, but my country does not have four seasons per year. While in the U.S. I decided to take photos of a tree outside my apartment throughout the year. Here are two of them (one in the middle of winter, the other in the middle of summer):
http://www.uploadit.org/files2/071103-Tree_014.jpg
http://www.uploadit.org/files2/071103-Tree_019.jpg
EDIT: Changed images to links since they are rather large.