Wireless self-powered switch/ sensor
You may want to save energy and need some devices to help you to do so. But the problem is that you have to add some ugly electrical wirings onto your beautiful wall. Even though you can choose the wireless equipments, they still need power which seems to act against your original energy-saving intention.
Therefore, you said, just forget about it. What a pity！ So, I bet you need a series of sensors and switches like these ones from Enocean, a Germany based company. You wanna know why? Just check out the video by yourself.