Google Images : Search for image you want. Click on tools, click on usage rights, then click on creative commons. Al the images shown will be copyright free, but you still must site the source of your image.

Photos for Class : Search to download properly attributed, Creative Commons photos for school.

Pics4Learning : Seach for images for your school projects.

Pixabay : Over 1.8 million high quality stock images and videos.

Unsplash : The internet's source of freely-usable images.

Burst : Free stock photos for websites and commercial use.

Freeimages : Find and download free stock photos - all free for personal and commercial use.

Kaboompics : Find the perfect photo for you. All photos are free to download and use under the Kaboompics License.