To download a skin, simply click on the skin name or the sample screenshot. Be sure to download the BMP file, not the GIF screenshot. You can then apply the newly downloaded skin by right-clicking on the PowerArchiver toolbar and selecting 'Skin PowerArchiver Toolbar'. For Full PowerArchiver Skins click here.
I didn't like such large icons along with text labels making the toolbar even bigger, which is why I created this skin. It features small icons that are already labeled, so it's meant to be used with text labels turned off.