I have wanted to make a postage stamp quilt using light weight fusible interfacing, but have not been able to find that here. I was buying some necessary items the last time we were in the US and actually saw pre-printed (one inch squares) on sheer interfacing. It may have been water soluble! That would be great.
As far as I am concerned, there is nothing too small to save. One lady on this list has saved her selvages and made a library quilt. The printed parts of the selvages are the writing on the backs of her "books." She has the photo as her avatar.