Here's a few more pieces being created by my wonderful workshop attendees.
here, you'll also find I've experimented with using roofing felt for collage, and for some 3-dimensional exploration too. Since that time, I've done one other experiment, successfully, but not yet photographed: weaving! The roofing felt is very strong, and easy to cut, and I had fun painting on two pieces and weaving them together, and also weaving them first and then painting the woven-textured surface. You could also weave fibers and other stuff into the roofing felt. So many possibilities.... Here's one last image from my workshop.