This can come in handy for your stock photo needs.
https://ccsearch.creativecommons.org/
This is the first release of the new CC Search, aggregating data from publicly available repositories of open content. CC has no control over the results that are returned. Do not assume that the results displayed in this search portal are under a CC license. You should always follow the link to verify that the work is actually under a CC license and to verify the requirements of that license, including the proper form of attribution. Since there is no registration to use a CC license, CC has no way to determine what has and hasn’t been placed under the terms of a CC license. If you are in doubt you should contact the copyright holder directly, or try to contact the site where you found the content.