jPic WordPress Widget is a general purpose WordPress widget which shows a picture supplied by an URL.
You can see it in action at this page in a sidebar.
You can download the latest version from the Wordpress Plugins Directory.
You need to extract the content of the archive and to copy/move the inner directory "jpic-wordpress-widget" to the wp-content/plugins folder. Make sure that the path of the main php file is wp-content/plugins/jpic-wordpress-widget/jpic.php.
You have to configure the widget from the widget itself, adding it to a sidebar from "Presentation->Widgets".
The plugin is distributed under the GPL license.