Floating Flower Tip - Most flowers float pretty well on their own until they start to pool with water and slowly sink. For a longer lasting centerpiece, use bubble wrap to make little skirts for your flowers.
Make your own Lavender Candles - it's easy and costs less than store-bought. (I wonder if the lavender catches on fire? I think I would pour this mixture around the outside of a narrow pillar candle. or make a wax melt jar without the wick.