The sky over the Pi, right now
zenith
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horizon
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nadir
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This is the camera that colors the site — a small sensor on the Raspberry Pi, pointed at the sky. Above is its current view and the five-color palette it extracts from it; the numbers below the swatches are live (hue, lightness, and the scene's color temperature).
It used to run as its own little web service on a separate port. Now it's just a page here — pulled in by the same dead-simple static host that serves everything else. One web server, no extra moving parts.
If you want to know how the colors are derived, see This page is the color of the sky.