There are some instruction for the first quilt on this page here.
For the quilts below, see this page, which contains units folded to make polyhedra. By varying that unit a little, you get variation one, and variation two, which is the same as the units below.
Let me know if you would like some more instructions for making these origami "quilts".
This page transfered to http://make-origami.com/HelenaVerrill/home.php in May, 2015.