Image Style
Images Shapes
Add classes to an <img> element to easily style
                  images in any project.
                    
                    
                    Images - Bordered
An image may include a border to emphasize the edges of white or transparent content.
                    
                    
                    Thumbnalis - Custom Content
With a bit of extra markup, it's possible to add any kind of HTML content like headings, paragraphs, or buttons into thumbnails.
Images - Responsive
Images in Bootstrap 3 can be made responsive-friendly via the addition
                  of the .img-responsive class. This applies max-width: 100%;                  and height: auto; to the image so that it scales
                  nicely to the parent element.