- Morguefile (http://morguefile.com/)
- Pixabay (http://pixabay.com/en/)
- Sites with High Quality Photos You Can Use for Free (https://css-tricks.com/sites-with-high-quality-photos-you-can-use-for-free/) (note: see the comments on the post as well – good ones there!)
- Donna Fry’s Creative Commons post (https://fryed.wordpress.com/2015/08/18/are-teachers-taught-about-creative-commons/)
Brandon Grasley's Blog 
I have compiled a number of resources on Creative Commons here: https://fryed.wordpress.com/2015/08/18/are-teachers-taught-about-creative-commons/
Awesome – I’ve added it!