Plugin link: http://bit.ly/1qpRNjx First seamlessly WP integrated multiple post thumbnails plugin, turn your post/work thumbnail to a responsive slideshow of multiple images in no time. Adds extra options to help you easily set link to thumbnails. Ultimate Post Thumbnails also automatically match theme styles and even animations, includes a beautiful and powerful lightbox. The drag-and-drop backend is not only very easy to use, but also provides a lot of advanced options, much more!