To accomplish that open the file that has the system page you like and delete everything you don't want from it(except the system page of course). Next, from the file menu choose merge file and choose your configuration, this will merge your file with the current system page. You will have to move your home page items to the top most home page and fix some links but this will give you the system page.

Of course, if it is just a background or something you like it would be simpler to just copy and paste the image.