When buying PLR articles, most people use them as content articles for their site. They may be changed slightly to avoid duplicate content filters, but they remain essentially unchanged. Many website owners haven't thought much further than this use, but there are many, many other ways to use PLR articles.
To get more use out of your PLR articles, consider consolidating some of them into a larger format. Using the articles as the basis for an ebook will save an enormous amount of time on research and focus. They can be blended together and made straight into an ebook, or the article topics can simply be used to give the book direction. Ebooks are one of the biggest money makers for website owners, so having one or more ebooks at your disposal is a great way to make a steady income as well as to bring interested traffic into your site.
Reports are a useful way to use PLR articles as well. Many webmasters use free special reports as an incentive for email list sign ups. Some also sell reports on their websites. A report a few pages in length can easily be made up of PLR articles with a few transitions in between them.
To find high-quality PLR articles for any of these uses, look for a site that has inexpensive PLR packages available. In the PLR world, there is an enormous disparity in quality. Finding a site like The PLR that sells small article packages inexpensively is the best way to start putting together pages of content, or to consolidate the information into a larger format.