Do you have an image, but are unsure of its source?
Tin Eye Reverse Image Search allows you to discover image sources, by searching by image url, uploading the image file, or doing a drag-and drop of the image. You can also search Creative Commons Images by color.
The resources below are only a small sample of the websites offering freely available media online, so explore widely and have fun!
Remember though, not all images and media on these sites are guaranteed to be copyright free. Make sure you check the license of each image carefully before using them in your work. See the "Creative Commons" tab on the left for more information on licenses.