This is called Sekka shibori which is one of Itajime Shibori dye techniques. It's created by pleating, folding, clamping and dyeing the fabric. The fabric has to be folded and pressed neatly to create nice and precise patterns. (Little m Blue)
Aesthetic Patterns II & Bonus: Aesthetic Patterns II - a fresh and playful seamless patterns inspired by the fabulous & rad 80's which will give free way to your imagination. All the patterns were hand drawn, scanned at 600dpi and meticulously cleaned. Certainly they will look better if you give them life by using in different scope, as your scrapbook, branding identity, blog banners, various backgrounds, wrapping papers, fabric print as well as desktop and phone wallpapers and much more.