One of my favorite ways of adding icons to a site is by including them as data URL background images to pseudo-elements in my CSS.

A live CSS editor for writing persistent user style sheets. Customize your favorite sites, save and sync your styles.

Runway is a web-based tool that translates specially formatted comments in your stylesheet into a living styleguide. No dependencies or installation necessary! How does it work? Upload a stylesheet (CSS or SCSS only) and Runway will read those comments - complete with a name, description, and some sample HTML to render - and deploy a publicly sharable styleguide to the web.