What are the prettiest purple flowers and the prettiest flowers that will look the best with them?

Im taking a girl to prom that I've been with for two years but we arent currently together. Her favorite color is purple and her dress is purple. I want to make this day the best day ever for her and i want to win her back. I want to grow some flowers and make a boquet for her. I want to use purple flowers mainly and maybe white. I just want an idea of what flowers I need that will look absolutely amazing. I want it to be perfect. So any florists feel free to give your advise!! Prom is in 2 weeks is that long enough for the flowers to grow? Also she is wearing black jewelry with her dress. Please give me any ideas!