Rainbow Notebook is a OneNote notebook with sections in all 17 (!) colors. Each section has a page with a page background color that corresponds with the section color. The notebook now contains several Section Groups with different section naming schemes and layout covering alphabetic, numerical and color name schemes. Some have grids.
Any page can be turned into a page template.
You can use this notebook as the basis of a new notebook of your own, or copy the sections to an existing notebook.