The trend of hero images may be summarized as large attractive headers. Most of these images are photographs which directly relate to the content. But designers have gotten crafty with vector backgrounds, illustrated artwork, and even animated video.
Here's a free PSD header for a web page with "Call to Action" button, you can use in your web design work. These type of design are great for big header images. PSD file comes in layered and pixel perfect design.
NOTE: Link for image and font can be found in "Credits" file.