Experiment with 4 inch copper tape and Silhouette Cameo to make paper and leather circuits.
At ITP EdCamp, I experimented with creating really flat custom circuit boards on paper and leather. I applied 4-inch wide copper tape and cut thru only the copper layer, then peeled back the negative space to reveal the circuit. I used a pin to poke holes in the paper so that I could insert my electrical components. The leather project will be a bracelet with surface mount LEDs connected across the channel in the center.