PicDrome: Public Domain Pictures
From the site:
Picdrome.com is a growing Public Domain digital photography collection, free of copyright and licensed under Creative Commons CC0 1.0 Public Domain Dedication. All images are free to download for personal, educational and commercial use, without restriction. Whether you are a designer, photo editor, student or blogger, we are offering completely free photographs. On request we can provide the original full quality photos. Attribution is not required, but highly appreciated. Make sure to check our disclaimer regarding the licenses for the pictures presented on this website.
Categories include: abstract, miscellaneous, food & drink, nature, sports & rec, technology, travel, and more.