Ornamentations for wheel assemblies that are rotatably mounted on the hub assemblies of the wheel assemblies and configured to produce a variety of visual and/or audible effects. The ornamentations develop a spinning motion as the wheels rotate and remain spinning for a period of time after the rotation of the wheels is stopped. The ornamentations are generally disc shaped and can include light and/or sound generating elements. The ornamentations can be used in conjunction with spoked wheels such as bicycle wheels.