Pattern darning is an endless source of delight to me, too. It's found in so many places, with so many both parallel and divergent elements, as one would expect a form governed by both weaving's geometry and cultural preferences to be. Here's another for your collection - the embroidery of the Toda people of South India, one of the happy things we found prowling the fair trade artisans' markets there : https://string-or-nothing.com/2013/11/14/in-which-we-buy-embroideriespart-ii/