You would not believe it, but I just created (this week) a Latex TikZ library that helps me to create templates / journal inserts for the use case of handwritten notes. Although I believe in DIN A5 paper, it might be useful for someone:
\notebookpage{todo={[bottom,draw]3},fill dotted,paginate}
This will create a dotted page with 3x2 todo notes at the bottom. The todo fields are surrounded by a box (draw), and the page is paginated.