"Green is also known to have signified witchcraft, devilry and evil for its association with faeries and spirits of early English folklore. It also had an association with decay and toxicity"
The Wizard of Oz:
"In this story is the Emerald City, where everyone wears tinted glasses which make everything look green. According to the populist interpretation of the story, the city’s color is used by the author, L. Frank Baum, to illustrate the financial system of America in his day, as he lived in a time when America was debating the use of paper money versus gold."