Van Gogh’s The Starry Night, redrawn as PCB art. The cypress, the village and the church spire are all there, but the swirling sky is routed as actual copper/gold tracks (depending on how rich I am feeling). The PCB has no solder mask or silk screen in several locations so the LED light on the back can shine through for a fun effect.

Drag to pan, scroll to zoom; the sidebar toggles layers.
Drag to rotate. Every swirl in the sky is a copper track.