Hooks provided by the Metrolook skin.

'MetrolookAfterToolbox': Called after the toolbox (#p-tb) has been rendered
$tpl: MetrolookTemplate object

'MetrolookRightPanel': Called inside div#mw-panel-right; can be used to populate
that div element with ad HTML, for example.
$tpl: MetrolookTemplate object

'SkinMetrolookStyleModules': Called when defining the list of module styles to be
loaded by the Metrolook skin.
$skin: SkinMetrolook object
&$styles: Array of module names whose style will be loaded for the skin