You can use Book Darts line markers to connect wires to sheets of paper or cardboard inscribed with electrically conductive paint or ink. The photo, below, shows bronze Darts, but they are also available in stainless steel (I will probably transition to these) and brass. You could solder leads to them or just connect alligator clips. Great for use with Arduino, TouchBoard, PicoBoard, MaKey MaKey, etc.
