The default faceplate (black or white) can be replaced with a range of custom designs, each sold separately.
While faceplates mostly exist for aesthetic reasons, it still serves several other functional roles like airflow direction, dust and particle deterrence, and protection for the DVD-tray and memory slots. Note that only the faceplate on the Xbox 360 can be easily replaced and not the other parts of the casing.
Faceplates are only available for older Xbox 360 systems and are not compatible with Xbox 360 S consoles.
Xbox 360 controller faceplates can also be removed and replaced with a range of custom designs.