There are many sites around the web that offer content on Creative Commons (CC) licenses. There are even a few sites that offer nothing but CC-0 licenses, which mean that you don't have to cite them if you don't want to. The "Find Images" tab offers a number of sources but it is by no means a complete list.
There are also sites (like NYPL digital collections) that offer a number of images with no known copyright restrictions. This determination is often, but not always, made using the age of the item. If you are looking for images to use in works that you posting online and/or selling you need to consider where the item is coming from.
If you have questions or want help locating images for a project feel free to contact the art librarian. Contact info is located on the home page of this guide.
An ideal attribution for a Creative Commons item includes:
See the 'Citation Example' tab for examples of images with attributions.
For instructions and best practices creating attributions for items you've modified, items with multiple sources, etc. click on the link below to find more information:
Example of CC attribution for an item found on Flickr: