Subtle Patterns has been around for a pretty long while now. It's a great site. My designer colleagues use it quite a bit.

The only thing I wish it did was show the pattern size by default in the description. Some of them show it, but not all. And in my experience they vary a good bit.

Also, on the Github page, there is a .pat zip of all the patterns which makes it even better https://github.com/subtlepatterns/SubtlePatterns