Copy ZRevGUI.png  image from ZRev Panes folder and paste it in your zebra installed folder\Zebra2.data\Data\Images\Panes folder.
Copy script from  ZRev Script folder and paste it in your zebra installed folder\Zebra2.data\Data\Scripts.

NOTE:
Backup your original ZRev script before overwriting!

In order to rotate/change gui background; simply copy ZRevGUI_2.png / ZRevGUI_3.png, to \Zebra2.data\Data\Images\Panes folder;
and just rename it to ZRevGUI.png [delete old one {ZRevGUI.png}].
"Refresh" plugin and...

That's it. 
Enjoy. :)