In the movie "The Color Purple" Alice Walker used purple as a symbol of God's love for mankind. Purple plants were a gift.

Celia, the main character, was so dead emotionally and only surviving with an oppressive husband. 

With the help of her friend,  Shugs , eventually Celia learned how to love life and as a result she started to decorate her home in hues of red and purple!

Purple represents sacredness and bravery.