I saw this on The Brick Fan daily email, about a Kickstarter project looking for funding. It is called 'iBrix' and it's a cool idea to use wireless power to light individual bricks. You put a power pad underneath your base plate and the power is transmitted wirelessly to the individual light bricks. Take a look at the link for how it looks and works. I would definitely be interested in this if it gets developed.
https://www.kickstarter.com/projects/1426110532/i-brix-wireless-lighting-system-for-lego-building