Pageskin type advertisements are a great way to feature sponsors on your website. You can see an example of this on our Games demo: http://goodlife.fuelthemes.net/games-demo/. Pageskin is actually your website background, so you need to assign it from Appearance > Background
You can now add clickable content on top of your website over this background image from Appearance > Theme Options > Advertisements
As you can see we have added a transparent PNG image to blend the background with the clickable element.