Dear Booxtor, maybe you could add to your first post the information about Scribble backgrounds given here: https://www.mobileread.com/forums/sho...&postcount=236
Additionaly, I uploaded some PNG-templates as an alternative to kodomo's templates. See attachment.
EDIT: Added gray lines/squares/stave for better contrast.
EDIT2: Added the same (gray) templates with 1200 x 1200 pixels. They can be used in horizontal and vertical display mode now.