Once full, connect the wire at both ends to form a wreath of ping pong balls. Paint the wreath the color of your choice, and use a hot glue gun to adorn it with faux flowers, foliage, ribbons ...

This is a super-accurate clock That uses ping-pong balls as diffusers for LEDs ... separating them by color. I’ll reuse all of the green LEDs, the transistors, pin headers, some resistors ...