This is a recent favorite project of mine. A series of “assignments” were posted and people from all over were invited to participate by completing the assignment in whatever way they wanted to, taking a photo, video, etc and posting their project on the site. I love it both as a source of inspiration for random projects but even more as a concept.
See:
Revel Art 
YAY, CLARA!! I’m so glad you are in on this project. By this project I mean “Art Night,” but I suppose I also mean “Learning to Love You More.” I love how interactive/collaborative/ongoing/playful/exploratative it is. Thank you for sharing!!