One of the best ways to keep your visitors on your website is by showing them other relevant posts you have published. There are plenty of related posts available for WordPress but most of them simply show a list of posts. The WPBrigade Related Posts Thumbnails plugin lets you display related posts with thumbnails at the bottom of your posts.
This plugin displays related posts with thumbnails above them. Background, border, text size, and other settings can be customized. You can also change the number of related posts to display. Webmasters have the option to choose under which post types related posts are shown.