Clip art illustrates virtually every medium in the modern graphic arts. Whether paid or free, clip art has become the stock in trade of both amateur and professional desktop publishing. Originally, clip art received its name from the production process. Design teams would build scale models of a given layout as a "paste up"-that is, a larger version of the layout that would eventually be printed. The team photographed the paste up and used the negative to create the actual printing plate; however, previous to this, the paste up needed some pasting up. That is where the clip art came in.
As their website mentions, "Many Flickr users have chosen to offer their work under a Creative Commons license, and you can browse or search through content under each type of license." Flickr is a major source of image for the open source community and helps in promoting the unfettered exchange of information over the internet. The WP Plugin called Wp-Inject assists you in searching for images on flickr and then adding them to your articles in a jiffy.
Using clipart can be used for classroom activities, scrapbooking, computer graphics, or to just spice up a classroom and can be a great way to add a little flavor. This adds more excitement with color and graphics to just about anything. If you're thinking about using clipart, it's wise to use royalty-free graphics. There are a variety of places where you can get clipart that is royalty free.