I don't know if street art ever really works indoors. If you domesticate an animal, it goes from being wild and free to sterile, fat and sleepy. So maybe the art should stay outside.
BanksyPainting something that defies the law of the land is good. Painting something that defies the law of the land and the law of gravity at the same time is ideal.
BanksyIf you feel dirty, insignificant or unloved, then rats are a good role model. They exist without permission, they have no respect for the hierarchy of society, and they have sex 50 times a day.
Banksy