Change entity_picture via scene

Feature Requests
1

I have a Nest thermostat and I’d like to automatically change the entity_picture based on the current_operation attribute. It seems like changing this attribute is currently not possible, as I get the following error:

16-04-21 12:10:56 homeassistant.helpers.state: reproduce_state: Unable to reproduce state <state thermostat.hallway=None; entity_picture=/local/nest_idle.png @ 2016-04-21T12:10:03.780959-05:00>
2

Additionally to the original request, I would see a benefit if it becomes possible to set specific icons for individual devices at specific states.
This is possible in FHEM (some other smarthome solution), and it’s actually quite useful if you can tell just by looking at the icon if it is a door or a window that is opened / closed. Yes, it’s indeed just eye-candy.

I would imagine the configuration.yaml to look something like this:

binary_sensor:
  - platform: whatever
    name: "Testdoor"
    icon_on: "door_r_closed.png"
    icon_off: "door_r_open.png"
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