Diapering
Diapering: Heraldic term  referring to the field or a charge being decorated with damask or arabesque or knotwork in a lighter or darker shade of the tincture it is on. Thus it gives ornamentation without being a part of device.
Note: In the above example, the field is diapered with light gold on dark gold and the chief is diapered with light green on dark green.

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