Be careful: most Creative Commons images require attribution, meaning you need to give credit to the artist in order to use the image. Make sure you understand Creative Commons and other licenses 3 Popular Image Licenses You Need To Be Familiar With Before Using Someone's Photos 3 Popular Image Licenses You Need To Be Familiar With Before Using Someone's Photos Read More before using such images. 

Bing Image Search uses a copyright filter based on the Creative Commons licensing system.  The results that are returned are images that have been tagged with Creative Commons licenses.  A link to the source of the image is provided, which you should use to review the source of the image and the applicable license to determine whether your use will comply with the license. (The settings can be switched to show all web results to view more images.)  However, you are responsible for respecting others’ rights, including copyright. Learn more here.

This is TERRIBLE! Besides being able to edit vector images like Will mentioned (which is important for those of us who don't have graphic artists available to create custom images or the budget or time to buy that service ad hoc), you could also search for style "families" (different graphics that were all in the same style). There was a huge range of files and styles in the collection and it was much faster to find what you need than to do a Bing search. Plus, you knew that everything there was free and free to use, without having to worry about CC license issues.
My school district doesn't allow students to access anything except Google; therefore, clipart is useless. More and more school districts and companies are blocking applications and websites to prevent access to inappropriate images and content. My first and second graders have always loved doing PowerPoints; however, with clipart no longer working, they cannot do these projects any longer. Older students access Google images to get graphics for their projects.
While most references to Clip Art disappeared with Office 2013, users were able to insert the old-school images into documents using an Office.com Clip Art option. That is now being replaced by Bing Images, with Microsoft filtering images to ensure they’re based on the Creative Commons licensing system for personal or commercial use. Most of the new images are much more modern, instead of the illustrated remnants of the past. Clip Art might be facing the same Office-related demise as the great Clippy assistant, but let the images below remind you of the good old times before the modern-era takeover. 
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