This is my first time that I have tried to make a soft circuit. I used a simple tilt sensor to control the LED light. The brown color is the conductive tape and the components are soldered onto the tape. Tilting it up turns off the LED, tilting it down keeps the LED on, and remains lit even on the surface.
To make a soft button – I used bits of neoprene fabric and strips of conductive fabric. Take a neoprene fabric with a hole in the center, and sandwich it between a pair of neoprene (non-conductive) and conductive fabric as shown. The hole enables the conductive fabrics to touch each other and completes the circuit thereby acting as a button or switch. For demo purposes, I connected the regular wires used in the above soft-paper-circuit onto the conductive fabric.