A fireplace that you can turn on and off.
If you press a button at the top, the Netherrack is lit by a lighter and if you press a button at the bottom, a piston pushes the wall forward which smothers the fire again.
The inner workings of the fireplace:
I also have a 2nd version in stock. with this there is always only one button to turn on the fire and turn off the fire.
Instructions:Since I'm too lazy to explain the Redstone thing (and everyone has probably figured it out by now) I'll add my YouTube tutorial:
Here still in video to the fireplace with a total of only 2 knobs: