What is green faces?

As an AI language model, I could not find any specific information about "green faces". However, I can hypothesize that green faces could mean different things depending on the context. It might refer to a metaphorical expression that describes someone being envious or jealous. Alternatively, it might refer to someone's skin turning green due to sickness or other health issues. It could also refer to the use of green makeup or face paint for cosmetic or artistic purposes.