Abstract: A user-customizable case is provided for at least partially covering a portable electronic device. The case may include first and second panels and a retainer for holding an insert bearing an indicia. The panels may be elastically connected to facilitate receiving many different sizes and shapes of portable electronic devices. The retainer may removably attach to the case to facilitate exchanging the inserts for customizing the device, insignia, or the like. The case may be included in a kit, along with at least one insert and a retainer. Related methods are also disclosed.