I usually make large twin/small queen sized projects for donations and "pieces big enough for backs" has always been an issue. I have fun piecing backs but not everybody appreciates. Most of my stash at this point are pieces 3 yards or less, I do still have a few larger pieces but not many.
All of my tops waiting to be quilted down have their backs, bindings, and typically an idea of how to quilt -- and that's the really hard part for me. I did buy a number (8??) large scale extra wide backs and will use them for color suggestions for the top. However we are inspired, I will take it!
So I know I have at least one good one for a civil war type project. Another for a black/multi-color, another white/multi that I think I know the top I want (a sampler with bright batiks on white that I haven't made yet)... I should go look and see if anything perks me up and begs to be used.