This request has not really something to do with Mapmaking, but maybe someone can point me to a tutorial or another forum.

That said, im currently makin the Campaign Guide for my Broca Campaign map (that I posted earlier), I´m doint it with scribus, but I want it to have the kind of same layout as normal Pathfinder books.
I tried making a page Background with gimp, but cant really figure out how to do it. i want the pages to have an background like this:

is there a tutorial for something like it, i dont even know how its called.