Bomb squad officers examined the packages had been found by members of the public in Shepherd’s Bush and Hammersmith on Wednesday morning.
Detectives said a woman later walked into a police station claiming to have placed the items as works of art.
The 36-year-old from Shepherd’s Bush has been arrested on suspicion of causing a public nuisance.
Some of the packages were cardboard boxes containing soft toys and training shoes with nails sticking out of them. One, in Charecroft Way, Shepherd’s Bush, consisted of three cardboard tubes supporting a polystyrene “altar” on which stood some flowers and a note which talked about the loss of a “Pelagius”.
It read: “Your absence has gone through us like thread through a needle. Everything we do is stitched with its colour…”