Rearview Mirror Hanging Signs. You will not find this product anywhere else on the market. This is a CarDecor.com exclusive car accessory product. The decorative Rearview Mirror Hanger fits around the base of the car's rearview mirrow and hangs facing outwards. Made of durable vinyl the CarXpression sign is fade resistant and will last for years. Shop Car Decor for a variety of girly car accessories.