Couching may be combined with existing outline stitch methods.
Couching designs are typically made up of straight running stitch outlines:
These may cross over themselves or other objects in a continuous fashion.
It is best to avoid long runs of overlapping cord.
It is ok to have couching objects separated by a trim/jump.
It is ok to have sharp corners but avoid extremes.
It is possible to combine normal embroidery and couching in the same design.
It is possible to create couching-only designs with no other embroidery stitching.
It is possible to use some existing fill stitch methods for couching if you set object properties for open density with no underlay.