What nail polish would match purple and blue?

I have this white, black, and medium purple dress. Then I have this white, black, gray, turquoise blue dress that I also have to wear later on in the day. At first I was going to get a french manicure until I saw the price it costs more than the dresses! So I just plan on getting a manicure (cheap only $10) My dilemma is that I need a nail color that would match both dresses.