“In order to make a site that people can use, every element on the screen needs a Content pattern and a Display pattern applied to it. Embracing the difference in pattern types is the key to making a modular design system infinitely more scalable.”
patterns
This Is Responsive
“Tips, Resources and Patterns for Responsive Web Design”
Patternify
CSS Pattern Generator
Pears
“Collect, test, and experiment with interface pattern pairings of CSS & HTML. Pears is an open source WordPress theme, enabling people like you to get your own pattern library up and running quickly.”
pttrns
iOS UI Patterns