How about using the left over batting for the panels for a quilted handbag? I cut mine 14 X 15 and often I have that much left over on the edge of a batting. If you have pieces 7 or 8 inches wide, , you can cut several pieces and zig-zag them together. Once they are inside the quilted piece, one would never know.
Oh, I forgot to tell you, my middle name is "frugal" and if you could see my basement, you would know it is true.
June in Cincinnati