Here is my first idea, name GoodNight.
GoodNight could detect the darkness of surroundings, so if I turn off the light, it will light up itself and show the time on the surfaces. So I do not need to turn on the other night light.
My second idea is a small fan. And it could detect the concentration of Carbon Dioxide in the house. If the Carbon Dioxide concentration is too high, and it would turn on the fan automatically. So I do not need to open the door after I cooked.
The last idea is the simple toys for play. When I throw something onto the 9×9 board, and the board which is impacted would light up and show the scores. So when people stress out could play this game with their friends or classmates.