Like Windows folder background and icons can be customized similar way you can also customize your USB Pendrives. If you are looking for simplest way to personalize pendrive then here is freeware tool USB Personalizer.
USB Personalizer is a small tool that allows you to customize pendrives, ipods, and cellphones. You can select one background and icon for each folder in your pendrive, it also let you manage the files un your pendrive.
USB Personalizer
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