Shabbat Candles Organics

Furthering the previous discussion about substances that can or can't be used to keep Shabbat serenity burning, we segue into the nature of vegetative sources of the required fuel. In the biblical image of illumination, the olive looms large; the question at hand is whether Shabbat candlesticks should best replicate the Menorah or instead focus on pragmatic considerations. (Tractate Shabbat 26A)