If you are an earth tone or gold jewelry gal (most women are) then you need yourself a gold flat. A gold flat solves the which-shoe-works-with-this-outfit problem faster than any other colored shoe. Browns don't always work. Nude can be too neutral and all other colors can go wrong easily.
When working with my clients I always put a gold flat on our shopping list. Which gold flat depends on the client, but my go-to gold flat choices are Jimmy Choo's "Finlay" flat and Michael Kor's Aria ballet flat in gold. The Michael Kors flat I get at Macy's, but they do not have it available online, so I have linked to it's pewter, and equally fabulous, sister on Zappos. Both these flats are incredibly comfortable, especially the Michael Kors. Every single client comments on its comfort.
Today, I put a pair of the Michael Kors on a lovely fifty something woman and ordered four pairs of the Jimmy Choo for a client that fears the "Finlay" will stop being made. A smart move. The perfect gold flat will never go out of style.