More details coming here soon, perhaps even a swank tool to trigger searches for you. Until then, our suggestions include:
- Compfight (searches flickr creative commons)
- Creative Commons Search
- Wikimedia Commons a huge amount of media available for reuse.
- Unsplash
- Google Images (with media set for licensed for reuse) You have to click Search Tools and select
Creative Commons Licensesfrom theUsage Rightsmenu.