something we have sitting around at home which I find magical, are cute little tea lights that have a sensor that you can literally blow out, and blow back on again!
You do then have to put a new battery them even if they've been sat around in "off" state for too long, because I guess the sensor draws a tiny bit of current to stay in operation. They're still cool though, if not super bright. The trick would be to find what that sensor is called...