I came across a happy blog, hosting an exciting challenge; a picture contest.
This isn't a photography contest per-say, but more of a photo-content contest.
Team Cowan posts a few themes, and takes photo submissions. The prize for winning is a themed patch, sort of like a boy-scout badge. Example:
Past challenges have included "Mystery" and "I'm glad I'm a girl" and they've got three sweet challenges up and running! All you have to do is hunt through your hard-drive or pull out your camera for fresh shots and send them their way.
I just think this is way too much fun!
The current contest closes in early July so go check it out!