Sashiko has practical as well as decorative applications

• Making many-layered cleaning cloths from old scrap fabric on YouTube, and also showing patching and mending them (as well as very helpful cat!). That channel has loads of tutorial content, much of it focused on using scraps, repurposing or mending. Also furoshiki
• this person went super deep on learning sashiko , noting that “authenticity has a really big price tag” if you aren’t in Japan. They do a whole bunch of different stitch designs.