The clear advantage of "metallic" is bling - and as I am now visiting my parents, and my mother is the most attracted to shiny things of anyone I have ever met, I decided she needed an expensive-looking manicure.
I did a "fish egg" accent nail (check out The PolishAholic for more info on the concept and controversy) with gold microbeads and CND Gold Chrome to give my mother a mani that could live up to her jewelry.
I also just got my lightbox! But I'm away from home, so still using my iPhone and trying to figure out exactly what to do with the thing. It's a learning process.