Pink and white are like a permanent french manicure. They actually use pink acrylic first, scrape off the tip and fill with white acrylic. So it's not just a white polish on top, the acrylic is actually pink and white.
Diamond Nails in Wildewood Shopping Center does them and they do a good job. I've had them done and am probably having them done again next time.
They also do other colored tips that look really cute on the sample hands, but I don't know if I'd do them for myself.