Here are two different photo series that play with Superhero themes.
Dulce Pinzon's explores the lives of Mexican immigrant workers in New York, paralleling their struggle and sacrifice for their families to that of the more traditional comic book icons, and essentially stating they are the real heroes despite having any supernatural powers. See more of the photographs here, as well as further insight into this project.
Ian Pool has a decidedly more comedic take on the lives of Superheroes with his series, showcasing what they do when no-one is looking. You can see the rest here. One lingering question... what is Darth Vader's favorite bathroom reading material?