You can add the arrows and lines by editing customer/categories.tpl. As far as adding an image background to the menu box, that is controlled by the .VertMenuTitle class in skin1.css. Take a look at the way background images are used in the button class and do the same thing. Just keep in mind that changing this will change ALL of your menu backgrounds.
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Padraic Ryan
Ryan Design Studio
Professional E-Commerce Development
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