If you get involved with CSS jquery, you can get the icons by applying a base class .ui-iconand an appropriate icon class (e.g. -.ui-icon-close for the close button) to your element (usually a range)
The jQuery wiki has a complete list of icons and their classes, you can find it here: http://wiki.jqueryui.com/w/page/12137970/jQuery-UI-CSS-Framework
Just inspect the icon and get a class.
EDIT
Using example
<span class="ui-icon ui-icon-zoomin"></span>
<span class="ui-icon ui-icon-play"></span>
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