Just recently I got my hands on some electrically conductive paint and decided to put it to the test. It functions well for creating resistive elements like custom potentiometers, and also seems to work really well for capacitive touch elements. At the end of the video I painted a small patch of it on the side of my monitor to add a touch button that can be programmed using a small Python script (included in the video description).
Anyway, here it is:
Anyway, here it is: