www.3creativestudios.com has two challenges that this works for-The Journal Quilt and The Technique of the Month which is freemotion Couching.
I don't have a Bernina which has a special foot for this with a guide for the thread you are couching. I have a Pfaff which I love but this was hard without the guide. I kept trying to rig a guide up but so far none of my ideas has worked.
The leaf shapes are fused. Then I used a knitting braid for the couching which also becomes the quilting. I think this technique has lots of possibilities.