RewardStyle & LikeToKnowIt offer a great Wordpress embed option via a [shortcode] or sidebar widget.
Depending on your use, if the widget causes page scrolling to stop functioning after you click on a photo in the widget, then you can add this Custom CSS to the page or blog template that's used. This will help format it better for use with a Showit design, however it doesn't completely resolve every issue.
overflow: inherit !important;
position: inherit !important;