Creating Pleats in Grasshopper + Generating Geometry from surface

Hi all,

For this project I am trying to recreate a pleated paper form. I have written the definition of my "pleats" and would now like to replace the two curves and their resulting surface with curves written in grasshopper, however I am new to this and this (seemingly) simple part is frustrating me. I would like to be able to change the length of the curves and their amplitude, resulting in asymetrical, twisted shapes. I have attached my rhino and grasshopper files as well as an inspiration picture- any help defining the initial curves in grasshopper would be greatly appreciated!

pleated paper: http://www.flickriver.com/photos/richardsweeney/2089137825/

https://www.flickr.com/photos/richardsweeney/2089127941/

Thanks!

R