Docking platforms formed in one of the largest-surface-area surfaces of mobile electronic devices. Such a docking platform may comprise a docking accessory cavity having a docking connection system comprising one or more docking connectors formed within the cavity, and optionally two or more electrical contacts within the cavity, the contacts electrically connected to electronics within the electronic device and constructed and arranged to allow electrical connection to detachable docking accessories. The docking connection system is operable to form detachable attachments to multiple independent docking accessories simultaneously. The cavities of the docking platforms are shaped to accommodate a broad range of docking accessories that are specially adapted to sit in a generally flush manner with the back surface of the mobile electronic device while attached to the docking connectors. One type of accessory forms an assembly with an expandable accordion attached to the docking platform.