Daniel,  All you would have to do is make a copy of the widgetTemplateSkin and call it something else add the code I provided and then in the widget you want to use that skin just add the skinclass attribute to the WidgetTemplate element.
<!--My Add--> <s:Rect id="widgetBack" Â Â bottom="0" Â Â left="0" Â Â visible.closed="false" Â Â includeInLayout.closed="false" Â Â visible.minimized="false" Â Â includeInLayout.minimized="false" Â Â width="155" Â Â height="128" Â Â alpha="0.6" Â Â radiusX="5" Â Â radiusY="5"> Â <s:fill> Â Â <s:BitmapFill source="@Embed('assets/images/widgetBack.png')" smooth="true" /> Â </s:fill> </s:Rect> <!--End My Add-->
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