Hand crafted clocks made from data or music CD's.
CD's are silk screened with the artist's or software manufacturer's information on the back.
The center section of most CD's are clear, while others are silkscreened in the color of the background.
I have access to CD's that are colored Clear, Gray, Red/Black, Blue, Mustard, White, and Black.
You can also supply your own.
See closeup views of CD center holes below.
Clear CD's are the most commonly used and go with any room color combination.
Note that in the finished clock, the center hole itself is completely covered by the clock hands.