trappings
the chair was decorated in a very ornamental fashion
emblemata
Perhaps the word you are looking for is ornamental, as in the clock was an ornamental in her family room. It can be used as both a noun and adjective.
nef
The ceremonial mace
I put the harness on the horse.
ornate, embellishing, exquisite, fancy, garnished
The harness was attached to the ring for secure safety.
Its very simple, antonym for the word harness is "unharness". some other synonms are control, manage, utilize, and exploit.
There is no such word as holiculture but there is horticulture. It means the cultivation of vegetables, fruits, flowers, or ornamental plants.
The definition of the word harness is simple a set of straps that attach to the body of an animal and its vehicle or rider to allow that person to have control. It can also mean the straps to attach a parachute or safety harness to a person when climbing.
Har.ness I think...