For many years we improvised different combinations of greenery, even using florist foam some years. Last year (or maybe the year before) we were given this star shaped candle holder. The little olive wood nativity scene from Aid to the Church in Need fits nicely. Aid to the Church in Need is well worth a look. You can sign up for a monthly newsletter called The Mirror which helps put things in perspective.
Our candles are mismatched this year, but still three purple, one rose and one white. Each Sunday a new one is lit. The origins of this custom are Lutheran rather than Catholic. Playing with fire is fun wherever you come from.