Photo essays are fairly easy to create. Anything that you can write a story about you can make a photo essay about. Besides, remember that saying, "a picture says a thousand words" ?
I'm planning on doing my own photo essay on the St. Patrick's Day Parade here in SLC, UT. I'll probably take some pictures of the pre-parade set up, and then pictures from the side of the parade, as well as from our school float. Having pictures from the parade as well as "into" the parade should have the variety needed to actually show this once a year event.
I hope this turns out well, because I had fun taking all the pictures.