WordPress Random Animated Gif is the new WordPress plugin you can use for displaying cool random GIFs in your WordPress site posts, pages, custom post type, widget areas etc. It randomly grabs GIF froms GIFs4u.com and displays it in your website.
Installation & Usage: Install and activate WordPress Random Animated Gif plugin. It provides both widget and shortcode.
Visit your admin area Dashboard -> Appearance -> Widgets page and drag WRAG widget to sidebar or any other widget area of your choice. No other options to set.
Also you can use its shortcode [animated-gif] for displaying random GIFs inside your post content etc.