Ma-Ma is seen playing with a sculpture during the scene where Techie initiates war protocol, shutting down the block. It can be assumed she takes them from him because she likes them. In fact, in the final scene where Ma-Ma is confronted there are in fact 2 wire sculptures. One on the floor by Anderson and the other on her bed.
The sculpture is symbolic of Ma-Ma's humanity. She was not always so cruel, circumstance made her that way. The first sculpture is on the floor, far from her. This representing her humanity as of late and in that moment. But when faced with death, amidst the blood and pills the sculpture is prominently on show and close to her.
Prior to taking control of Peach Trees, Ma-Ma was a prostitute. Lester Grimes, her pimp, one day found out that Ma-Ma intended to leave him. She was in a relationship with a man named Eric. Eric was an intelligent man. He was skilled with computers, chemistry and circuitry. It was in fact Eric who invented Slo-Mo, with the intent of it being a way for him to provide for Ma-Ma.
Eric was eventually tracked down by Lester Grimes. He broke into his apartment and killed him brutally. Stringing him up on the wall, Grimes then waited for Ma-Ma to arrive. As expected the event traumatized Ma-Ma, she was reminded of her place and who she "belonged" to. Grimes then gave Ma-Ma her signature scar as punishment.
Sometime later Ma-Ma decided to rebel and get away from Grimes. Prior to performing fellatio on him, she offered him some Slo-Mo. Accepting it, Ma-Ma proceeded to feminize Grimes with her teeth. She left him to bleed to death. She then took over Grimes' industry and assets to create a platform for her to distribute Slo-Mo.
Techie is in some way reminds Ma-Ma of Eric. She treats him horribly but yet finds his work impressive. She has some attachment to him and likes his sculptures enough to take them for herself.
In the final scene the objects in her trophy case, the items strewn across her bed, represent her as a person. They are quite blunt pieces of symbolism but effective if time is taken to learn her backstory and dissect her character. None of the items are more important than the sculpture.
The jacket and guns showing her conquest, the judge helmet showing her disdain for authority. Her outstretched arm in the light reaching for her gun says quite a bit as well. The idea that she would sleep with a gun speaks for itself. The gun being lit signifying the path she chose and where it got her. While the pills, sculpture and her own blood are in the dark. Contrasting how she appears on the outside to what is behind her cold eyes.
(It can also be interpreted that the light shows she died by the gun and not by drugs, as one would assume)
In the end, she made poor choices but all the same was corrupted by the cruel world she and millions of others inhabit. With all the damage caused by her, there is an attempt by the director and writers to paint her in a sympathetic light.
I could be more specific, but in the end once you notice these details the picture paints itself.