Forget about running wires to electronic pieces on your layouts/dioramas.
http://www.electroninks.com/products/
To be practical for a moment (and how uncharacteristic of me), suppose you wanted to connect a small battery to a pair of tiny bulbs with this method. How would it work? And, unless I have really missed the point, wouldn't it actually be easier to use wire? I love technology, though, so perhaps somebody could suggest hobby situations where this cool idea would be the best choice. -- Russ