Hi. In most of the places we have used the icomoon’s icon fonts, which has thousands of good quality free icons. We have used these icons for example for styling the meta information. You can build your own icon set and use it with our theme easily. You can create your icon set by going here – http://icomoon.io/app-features.html
Rest of the icons that are not icon fonts, we have bundled them as seperate psd files (for eg. social media icons).
Hope that helps,