I've been pondering a larger design wall for ages. So when a guildmate offered me some white flannel at a very good price I said "Yes, Please!" and took myself off to Lowes to get some foam insulation boards. Some cutting and ironing and stapling and screwing into the wall later, I have a very nice, very large design wall!
As a comparison, here is the before with my old design "wall":
I have one more insulation panel to cut down, cover and hang (it will go behind the open door, but will give me even more space!) and then it will be done. But until then, this will be well loved.