i've posted a couple of things similar to this before, but that's probably because i still think it's a great idea! these wallplates are by justin porcano, and are another kickstarter project (previously mentioned here and here).
the design works because it is a common observation: when you enter your house, you want to store away the keys you've just used, and turn on the lights to the house. when you want to leave the house, you'd grab your keys and turn off the lights.
this one hasn't quite reached it's goal at the time of this post, so head over to it's kickstarter page and pledge!