Decide on your clock's shape. Adhere paper to foam-core board using spray adhesive. Cut out the desired shape using a crafts knife.
If desired, paint chipboard numbers in a coordinating color; let dry. Attach to the clock face with glue.
Mark the location for the clockworks. Using a 5/16-inch-diameter dowel sharpened to a point (or a round pencil or awl), puncture a 5/16-inch hole. Carefully trim excess paper from the hole with a crafts knife.
Follow the manufacturer's instructions to attach the clockworks