A case assembly adapted to be assembled into a case for a portable electronic device has a single case front and multiple case backs packaged for sale in a single package. The case front is adapted to mate with each of the case backs to form a case dimensioned to hold a different size of portable electronic device. The case front has an opening such that a control of the portable device can be accessed through the case front. A two-way, mirrored finished may be constructed on the front such that light emitting elements of the case and display can only be viewed thorough the case exterior when the elements are lit. The case front and back form openings for the input/and outputs of the device when coupled together. A case back with and without a belt-clip or armband may be included.