Top and Bottom images...?

I looked through all of the completed template mods... and I couldn't seem to find a good one on how to add top and bottom images above each category on the main forum page (like this forum does). Is there a tutorial on this somewhere that I just happened to miss? If not... can someone tell me how to do it? What templates do I edit?

Also, how do I add the same top/bottom images for each topic page/etc?

Any help is appreciated.