A CodePen by Matt. Scalable textures : toolkit gallery v.1.2 - Please love and reuse these textures. I collected and display here 40+ elegant black or white textures with associated code. Helpful for designers to see and reuse them. Submissions: Patterns/texture submission welcome on the /details#chat!

Source: Most patterns are available for free @ http://subtlepatterns.com/snacks/ . For your offline developments, just download:
Subtle Patterns Volume 1
Subtle Patterns Volume 2
Subtle Patterns Volume 3

Forks: Great CSS forked from @SaraSoueidan/pen/KvCiy .
Others: Please avoid Forks not followed by meaningful edits. If you just like then "Heart/Like" the pen to keep it in your personal _"loved items list"_