The place where I get a pedicure does a French pedicure for the same price as color only.
I really like the look of a French mani-pedicure. It's a neat, groomed look, but unlike really bright polish, it's also a very adult, professional look, and it's never out of style or out of place in any office setting. Sometimes, bright polish can look a little garish at the office. A French look, on the other hand, is understated elegance, and even looks nice on shorter nails, which is another advantage.
My toenails are so tiny, a French pedicure wouldn't even show up, except on my big toes. So, when I get a pedicure, I opt for a nude/light pink polish that looks groomed, but natural.