If you have made a FAT32 image partition using MakePartImage and included the Clover Tool Pack (to directly boot to UEFI) in your .imgPTN partition images, you can configure Clover. If you are new to MakePartImage see here.
Tip: If you do not want the Clover UEFI boot menu entry to be present in the CSM menu, you can delete the \boot7 file from the .imgPTN file or edit the \menu.lst file.
Note: The version of Clover that is used is quite old. Recent versions of Clover do not seem to work as well. I had a lot of difficulty in finding a version that worked as expected and showed all the .EFI files, etc. The format of the config.plist has also changed over time and seems to be quite inconsistent between versions. If you are tempted to use a later version of Clover, you may experience some difficulty!
To change the 'theme' (screen icons, colours, etc.) download a theme package (see here). Extract the 'payload' folder using 7Zip or some other tool and replace the folder at .\EFI\CLOVER\themes\ with your new folder. If there is only one folder under .\themes then Clover will automatically use it (if you have more than one then you will need to edit \EFI\CLOVER\config.plist to set the default theme).
e.g. For an orange theme, the folder inside the .pkg file will be named 'orange' and there is usually an icons folder below it: e.g. the correct path structure for a theme called 'orange' is:
There should only be one folder (the name of the theme folder) under \EFI\CLOVER\themes.
For more information on Clover see the info and links here.
The \EFI\Clover\config.plist text file contains configuration settings.
You can suppress some of the boot icons by specifying more strings in the Hide key - e.g.
Note that if BOOTx64.EFI is specified, there won't be an icon for the UEFI boot file (may not work in some versions)! Specifying HD0 will remove all icons for efi files on HD0.
The easiest way to remove some of the unwanted boot icons in the Clover GUI is to delete their corresponding payload .efi files from the image partition - e.g. delete...
\bootmgr.efi (though check it is not needed for installing Windows in UEFI mode)