It's a good cause, so if you're getting yourself a new car, or new plates for some reason, why not make them pink? I do believe there's even a pink-on-white combination if you feel a pink background is too much of an eyesore.
Who knows, you might be a number plate fetishist and this is the best thing to happen since metallic plates.
Glenn McGrath's already got one. Why don't you get one too and support breast cancers victims while you're at it?