I don't know much about making kites or material, but I do know a bit about this topic. I was recently gifted my first Rokkaku kite kit from Ronda Brewer and it's terrific! It's a no-sew kit with everything you need to complete the kite, clear step by step assembly instructions, including info about different ways to decorate the sail, and detailed instructions to bridle the kite. It's awesome! http://www.phantomstardesign.com/web_pages/product_pages/kite_kits/rokkaku/rokkaku_kit_main.htm It's Tyvek, and can be painted, spray painted, or colored with a Sharpie. Ronda painted her first Rok over ten years ago and it still looks good, and she battles with it often. The Tyvek is super durable and holds color really well. I used Sharpie on mine and I love it! Hope this helps, good luck, and have fun with your grandkids! Sent from my iPhone using KiteLife mobile app