Here is a wonderful project that allows designers to create, submit a share free icons.
Project brief: The world contains a giant collection of symbols that communicate to us through a universal language. The Noun Project was created to house and organize this language in a single library that is fun, easy to use and free for everyone. It stands today as the best resource for designers to download and ultimately share this language. Utilizing existing libraries available in the public domain and symbols licensed under Creative Commons, this collection is free to the public, much like those libraries holding written language. Follow their project blog
Explore the collection and learn more at www.TheNounProject.com