Still not sure what you are exactly asking.
If you are looking for someone to create some graphics for you. I would try the request forums -- a battlefield graphic should not be to hard to do.
If you are asking how to add graphic borders to your own template and you have some HTML experience then I can pass you some references to some examples. Graphic borders are nothing more than a HTML element wrapper on the vBulletin page. Looking on your site's HTML the author has already added a few wrappers.
HTML Code:
<div id="pageWrapper">
<div class="pageWrap">
vBulletin Body HTML
</div>
</div>
</span>