Mmk, started looking into this, and I'll update this post as I go along.
First off, I'm going into the code, and the stuff we see there is a
transparent overlayIn this overlay, It's pretty default, except there's one pixel that's randomly out there at coordinates 315,498 (which should be viewable even in Paint if you've got navigation on in the bottom corner)
Next, I found it's using a javascript code named
google-analytics.com/ga.js, which is probably some default thing, I don't look into Javascript, so that's up there to look at (save to desktop or something, then open in Notepad so it doesn't run).
For the background, they used a clever trick so it couldn't be directly copied. They reference a CSS layout (just a webpage type for those unfamiliar) which can be found
here, which reveals the background image
here.
From there, I've increased levels and such, but it only looks like used parchment.