I just saw that a very typical sheet used a lot in Germany is missing in your awesome offering: Millimeterpapier, i.e. a 1mm grid with slighty thicker lines every 10 mm, in a reddish hue, as can bee seen here: https://de.wikipedia.org/wiki/Millimeterpapier - but from there I noticed that on Wikipedia there is already a ton of these PDFs as samples!