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.
Green craft project idea - Repurpose a tuna can and clothes pins to make a flower pot or candle holders. Would be cute to do with a kid to work on fine motor skills. Would be cute for grandparents or as a Mothers Day gift! =) mothers day present :)