I wish i remembered whose blog I saw an example of this technique on… I read about it and tried it during some design exploration exercises. Basically you use a very near color to create a feeling of motion and or depth. I used a slightly lighter blue and a slightly paler yellow for the swoop of air across the top. The batting has been added at this point too. It’ll help hold any Hans stitching I’m gonna do.
Free Form Quilts 