"I really love those earrings" or "where did you get that amazing shade of lipstick?"
I like watching their eyes light up and it costs me nothing to say it. The small repartee that sometimes ensues can be entertaining or at the worst I will get a very smiley thank you. I mean nothing by it but if it brightens their day even a little I am more than happy to do it.
I run into these women sometimes that remember me and will stop to tell me.
It's part of me sharing my happiness.