I've been trying to experiment with putting other things in the entryHeader itself, ideally images that are links to nameAnchors, etc. I've got an idea in mind for an unofficial innerJournal style chooser. Although the notion of a background image in there, is a new one for me... i'm assuming your css kinda looks like this for it..
background-position: top right; /* if background image, make it start in center */
background-attachment: fixed; /* if background image, make it scroll when scrollbars used */
background-image: url("www.headerImg.com/img.gif"); /* url for background image */
(runs off to see how your custom component code looks)