I decided on a roller shade, and it just happens a neighbor set one out in front of her house to get rid of after the yard sale. I asked of course, & she was pleased I could use it. It is a 6' width. I plan to have DH make a small wood 3-sided box (2 ends + the front)to install up at the ceiling of my sewing room in front of the one big window. As I don't have any significant wall space, this seems like the best solution. I will layout some clear painters dropcloth plastic on the concrete on a non-windy day, roll out the roller blind, use some spray adhesive, & lay over some flannel or crafters felt (if it holds the fabric well enough). Next, really smooth out the roll to keep it nice & flat; a paint roller on a long handle, with a clean roller will do. I plan to leave the plastic cover on the roller to keep it new & clean. Let it dry a while, trim down the sides & bottom & hang up.
See this video for the idea. The point in putting it in the box frame: so the larger roll doesn't hit the wall.
http://www.vanishingdesignwall.com/demonstration.html
I'm sure you could just remove the vinyl from the roller & put the felt or flannel on the roller alone, but I thought the flannel might be too lightweight. Some have sewn an extra pocket in the bottom & put a piece of EMT conduit (like 3/4" diameter) to weigh it down; or any wood dowel as well.