PC.DE are releasing 10 sets of 1000 high-quality free .png icons in sizes 16×16 & 32×32 for bloggers and web designers to use in private & commercial projects. They are under Creative Commons Attribution 3.0 License.

“Dortmund” icons and “Munich” icons designed for use in web designs with white background. All icons are oriented towards practical use and commerce. “Cologne” icons is blue in colour. The simple combination of blue and white feel light and can be used designing a wordpress theme or eccomerce store. “Hamburg” icons is a full colour set, which looks good on a personal blog and an online bank as well.

Requirements: -
Demo: http://pc.de/icons/
License: Creative Commons License