I've been using Flickr to host the photos that I'm taking of the Summer Institute. I discovered this morning that some folks are using Flickr to host creative writing written in response to photos. Check out flicktion. Click on a photo to read the caption. Some are clever short captions. Others are entire stories. Most are pretty good and the pictures are interesting. Might make for a good writing exercise for your students.
Maybe you can start your own Flickr account (it's free) and write some of your own flicktion. What else are folks doing with ptohos in their classroom?