Black roses convey the death of a feeling or idea. Sending black roses to someone indicates the death of the relationship. Mixed Roses: By mixing rose blooms of different colors purposefully, you can create a bouquet of emotions.t is also a color indicative of peace and tranquility. Green roses (these are off-white roses with shades of green) can symbolize best wishes for a prosperous new life or wishes for recovery of good health. Black Roses: Black is the color of death and farewell.