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Conductive Ink and Electric paint

Conductive Ink is an ink that results in a printed object which conducts electricity. The transformation from liquid ink to solid printing may involve drying, curing or melting processes.
can be a more economical way to lay down a modern conductive traces when compared to traditional industrial standards such as etching copper from copper plated substrates to form the same conductive traces on relevant substrates, as printing is a purely additive process producing little to no waste streams which then have to be recovered or treated.
it then develop into Circuit Scribe which is a ball point pen containing silver conductive ink that can be used to drawcircuits instantly on flexible substrates like paper.
 
Similar to drawing a picture, users can use a Circuit Scribe pen to draw lines on a simple piece of paper. They can then attach special electrical components on the drawn lines which allows the electrical currents to run through the components. This replaces the use of breadboards and wires.
 
The following video shows basic theroy of Circuir Scribe as well as Conductive Ink.
I found another product that have the similar function of the conductive ink, which called electric paint.Electric Paint is an electrically conductive paint that makes it possible to draw a circuit, cold solder a component or turn any surface into a sensor. The Touch Board is a piece of hardware that can transform Electric Paint sensor data into sound, light or data in the cloud. It provide users with context and focused project outcomes for these future-facing platforms, regardless of experience level. 
As I research for the conductive ink, I saw many example that have done by people, one of the example that is similar to what I am going to creat in my previous project which create a wall that contain conductive ink. William McShane and his magnetic + conductive paint LED display. On the video above William explains how it works.
Here’s a summary:
The display is first covered with a layer of magnetic paint and then coated with regular paint. William then drew the circuit traces with conductive paint. The LEDs have a magnet attached to each leg, so they will stick to the display when placed over the traces. 
Because lighting is one of the elements in interior and spacial design.Inspired by the both of them, they can be both used in making wall paper paint in interior design, which can have act as a function of the wire to transfer electricity to a light bulb. Also, we can apply sound on wall as well, since the conductive paint can conduct electricity, we can put small component on wall in order to help people interact with it.
Also, because it's characteristic, it can still conduct elecricity even it expanded into a certain length. Therefore,some people use these kind of material into fabric, textile design,it let their garment to appear in darkness.
Here  is another example that people apply the conductive ink onto the remade paper, which seems that the ink is a part of the pattern of the paper, and I think it can be used in fabric and textile design.
But the problem is because of the resistances,conductive ink can be used in a restricted range of 
applications Printed paper and plastic sheets have problematic characteristics, primarily high resistance and
lackof rigidity.
The resistances are too high for the majority of circuit board work, and the non rigid nature of the materials permits undesirable forces to be exerted on component connections, causing reliability problems.
Consequently such materials are only used in a restricted range of applications, usually where the flexibility is important and no parts are mounted on the sheet. 
 
Referance:
ALL THE VIDEO THAT SHOWED ABOVE
 
Conductive Ink and Electric paint
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Conductive Ink and Electric paint

conductive ink which can be used in a broad area.

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Creative Fields