Unfortunately, ON is very limiting in customizing rules (among other things)
& the "Very Narrow Lines" was created using some external tool we mere
mortals aren't privy to.
You can change the color of the "Very Narrow Lines" (& other similar
stationery) via Page Setup. Just select silver for 'Line color' & voila.
For eternal writing, the Page Setup's Paper size has to be on Auto. As
you're running out of space, just click the button at bottom of the vertical
scroll bar to add more vertical space to the page. However, given the limit
of 22" (whether on Auto or not), after 22" you can continue typing/writing
onto the gray background & it will/should still print. Not ideal, but...
Perhaps the designer of the template could create the multi-colored
horizontal/vertical stationery you want. see
<
http://www.mcse.ms/message1386158.html> & scroll down to Benoit Barabe
\(MS\)'s post starting with "I'll admit having used internal tools..."