Coordinated background sets for use in web page design are themed sets that usually consist of everything you will need for your webpage that is backgrounds, buttons, horizontal bars, welcome banners, e-mail, and links buttons. Many of these sets are created free for non-profit use, or are termed "linkware," which means that you may use them freely, so long as you credit the site where you found them with a link, so others can find their graphics, too.