I just removed the front cover as the clock itself is green, you could use blue/green cellophane, thin transparent blue/green acrylic or transparent blue/green paint to try and get green as iirc yellow and blue = green, to get the clock blue would be a bit harder, You would have to run the clock without the cover or cut a new one fron blue or clear acrylic as the yellow cover prevents you from having blue, reds the easiest to do as yellow to red isnt much of a change.
Lol reminds me of oxer stories.
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