Custom UI - icon color change

First, even without CustomUI you can use device_class to show a specialized on/off status and icon:

customize:
    binary_sensor.door_back_sensor:
      device_class: door # Also try window for another set of icons

If you want to use CustomUI to change icon color:

customize:
    binary_sensor.door_back_sensor:
      templates:
        rgb_color: "if (state === 'on') return [200, 100, 30]; else return [10, 20, 30];"
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