I've seen this done on certain WP sites...its just a css based image border that can create a shadow effect (such as on the page you are looking at now) that resizes with the height of the page (just a repeating image).
I'd like to know how to do this, as I'm using a modified template.
*A bonus* would be if I could get a shadow border on the bottom of the page (vertically) to stretch along with my dynamic width center column. But this is only wishful thinking.
Thank you in advance for any help and support!