If you don't know about The Totally Rad Show, you need to head over to (http://www.revision3.com/trs) and watch some episodes. They talk about all stuff rad but most often; movies, video games, TV, Comics, etc.
In the forums there have been numerous Photoshop projects. Above is my first such image. I think it turned out really well. You can join the Flickr group and see more at: http://www.flickr.com/groups/totallyradshow/