If you've been backing up to your local iTunes library, check your APPS pane to see if you have an older version of Shape stored locally. If you do, you can delete Shape from your phone, connect your phone to your computer, and drag the older version from your iTunes library onto your device. That's what I did to go back to the older version, which produced shapes that work much better for my purposes.
Adobe, it seems like with the newest version of Shape, you made DRASTIC changes to the way the app processes images into shapes. Is there any way for us to opt for the older version of processing? Or to toggle between the two?