Abstract: A decorative device, known as a corbel, for mounting to walls adjacent windows, for example, to create a window treatment, has a mounting bracket therefor. The device is made of a material such as expanded polystyrene, and the mounting bracket has sharpened tangs which penetrate the body of the device and grip it. The device further has a slot in the top thereof into which a depending leg of the bracket fits. With the leg in the slot and the tangs penetrating into the body, the device is affixed to, and firmly held by, the bracket. The device itself may be covered with decorative material and support other decorative devices such as scarves, curtain rods, and drapes, for example.