This uses the background-image property
This uses the background-image property along with a gradient background
This uses an image inside of the DIV

Progressive Internet Explorer (PIE)

This page was created with CSS3 and PIE; other than the PNGs in the top three examples, no images were used (or harmed) in the creation of this page.

This example is on the website, but I made a few changes to it to make the changes a little more obvious when I was testing it myself and I thought that it might be useful for someone else as well...