春光明媚 Beautiful spring
花红柳绿 Bonus柳绿 字典：1 bright red blossoms and green willows; a profusion of garden flowers
青山绿水 Mountains
鸟语花香 Flowers 字典：1[Literal] birds sing and flowers radiate their fragrance 2 a joyous scene in spring
百花盛开 Flowers in full bloom
百花齐放 Letting a hundred flowers bloom