UltimateZip supports toolbar skins, this means it’s very easy to change the toolbar images. To download new toolbar skins simply click Download Toolbar Skins from the help menu or visit the Skins section at the UltimateZip website.
(http://www.ultimatezip.com/skins) Here you can download a Skin Creator Tool.

Change a toolbar skin

Right click the toolbar and choose Toolbar Skins and then Load Toolbar Skin. Choose the skin you want to use and click OK. That’s it, now your new skin is loaded.

All Skins in the folder ...UltimateZip\Skins will be listed in the context menu.