Custom Fill Pattern

Hey gang,

Is there a way to create a custom fill pattern for FrameMaker?  I'm working on an emergency procedures manual and the pages have a heavy diagonal line pattern framing the content around the border of the page.  FrameMaker's diagonal Fill pattern is what I want, but with a 10-pt stroke (see below).  I don't know any way to do this other than to create the frame I want in another program and import it as a graphic.  Any ideas?

-terry-