get your disc brake rotor and paint you can use any colour.
Step 2: Mechanism
super glue the clock mechanism to the disc brake.
Step 3: Base
to make the base get a piece of wood to the desired size and using a saw make a 3mm deep cut in it. paint the base. now put some glue into were it has been cut and push the brake rotor in and allow the glue to dry.
Step 4: Clock handles
place the clock handles on the mechanism and you have made a clock using disc brakes