Green is the color of Nature and rejuvenation. Burning a green candle stimulates finances, brings good fortune, prosperity, luck & success! It's magic is renewal and balance. It can also be used to counteract greed & jealousy. So magical
Candle light wards might also be another thing. I can see Tsava Leko having wards based on candles around their caravan. Though I think his own wards where originally dolls that he used to focus elemental powers into.