Wait ... why are these colors representative of Miami?
I do not know where it originated, but by now because of many things. For me, (growing up in the Netherlands) those colors are representative of Miami mostly because of

Not just the logo, but also the colors of the suits they wore in that show.
And many other things that have to do with Miami that are done in pink and blue.
I think it has to do with the colors of the lights on the Miami boulevard, the color of the sunset and the water over there, the color of flamingo's, and 80's fashion somehow.
For example:
More