add an extra DIV to the testimonials ouput

Got a mockup of what you wan to accomplish?

Depending upon what you want, it’s either FAQ 48 or use widget_text.

Any response?

Have you looked into using CSS pseudo classes?

You can start experimenting with the following code to put icons before each of the testimonials.

.testimonialswidget_testimonial:before {
    content: url(https://www.presscoders.com/wp-content/themes/presscoders-2012/images/widget.png);
    display: block;
    float: left;
    margin-right: 5px;
    position: relative;
    bottom: 2px;
}