You can draw electrical wires with this cheap conductive paint.

Bare Conductive  is small studio in London that makes conductive viscous black paint.  It's carbon-based, which makes it quite affordable to experiment with. The studio has seen a growing community use its paint to make a  variety of surfaces come to life. Their favorite? An artist used it to  turn his paintings into musical instruments.

bY Mashable

by the way check here >>