Some great tools for creating backgrounds:


https://www.toptal.com/designers/subtlepatterns/

https://www.heropatterns.com

https://www.novapattern.com

https://dribbble.com/tags/pattern

https://patterninja.com

https://trianglify.io

https://coolbackgrounds.io

https://www.flaticon.com/pattern/

https://creativemarket.com/search?q=repeating+pattern