Gemicon is a set of over 600 original high-quality icons in resolutions of 16 × 16, 32 × 32 and 64 × 64 pixels and include all common items in web or app design. Icons are available in black and white.
You can use the set for all of your projects for free and without any restrictions. You may freely use it for both your private and commercial projects, including software, online services, templates and themes.
Download icons: http://www.smashingmagazine.com/2013/01/06/freebie-gemicon-icon-set-600-psd-source-png/