As a student I like to use different colours for different subjects - I think pastel coloured A4 templates with both narrow and wide rulings plus a margin would be very useful.
GoodNotes supports the import of any PDF or image as a custom template. We recommend creating your own custom templates and adding them to the template library in GoodNotes: https://support.goodnotes.com/hc/en-us/articles/360000115295-How-to-add-remove-custom-templates-to-from-the-template-library
+1 I love pastel colours for my notes too! Would prefer to be able to customise my own template background colours instead of having to create a custom template and adding to the template library.