This presentation show some examples of project combining electronic and paper.
Tutorial for simple paper circuit.
http://cdn.makezine.com/uploads/2014/07/papercircuits.pdf
This tutorial gives an overview of paper engineering with resources and sample projects for inspiration.
The Fine Art of Electronics
http://simonetti.media.mit.edu/~jieqi/
Folding pattern examples
http://www.korthalsaltes.com/selecion.php?sl=new