Well I would say it's popular, it's not really a trend since its been around for many years already
Answer: the warm colors of the flower and the cool color of the table give a nice contrast
Answer:
Sunflowers, to Vincent Van Gogh, symbolized "gratitude", and this was meaningful for him.
Explanation:
Assuming you meant Van Gogh and why he painted sunflowers! Sorry if I'm wrong ;(
The sugarhill gang in 1979