Several idioms using the word flower and related to something beautiful, playful, nice,.i.e: flower generation, flower child, flowery words, etc.
As one quote: "Flowers are happy things." - Sir P(elham) G(renville) Wodehouse.
For me, flower is one among the greatest God's gifts, their shape and color, their fragrance and stems, their beauty seems to ignore their surrounding.
Flowers and green.. that actually what our eyes need other than vitamin A:p