Is there a potential downside? Yes. Just because a search engine sees something as Creative Commons doesn’t necessarily mean that it is. Here at MakeUseOf, for example, we’ve had at least one photographer threaten to sue us over an image he didn’t realize he himself licensed as Creative Content. He backed down when we pointed this out, and it’s one example resulting from thousands of blog posts spread over a decade, but know that this isn’t without risk.
Clipart is used to create a web-design, you can also draw up bills, posters, make cards, collages and wallpapers. Thanks to ClipArt and its individual elements, the new image is created including all the elements; it looks like it’s a photomontage, a creation of new design. At the same time, it will be a big plus if ClipArt goes without a background, since you do not have to waste time removing it. What’s the format of this kind of image? These are wide known PNG and GIF formats; the images can be saved both with a background and without it. There are aslo scrapbook kits for creativity, which consist of png images; those are a set of elements and backgrounds.
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.