I so appreciate all the information that I have gleaned from this thread! I had recently purchased two boxes of the Polar Notions fabric sheet panels and found the system very effective for my every growing stash. But I couldn't really afford to go and buy more panels.
As suggested earlier on this board, I contacted a local sign shop and they GAVE their scrap material to me today! It's a bit thicker than my the Polar Notion panels, but Wow! I've cleaned the pieces and my DH has already cut then into the sizes I needed. Now I'm ready to wrap that fabric and put it to bed!