They’re cute as the dickens! 😀 You could name them for the Golden Girls TV show, maybe? Either the characters (choose from Dorothy, Rose, Blanche, or Sophia) or the actresses (Beatrice, Betty, Rue, or Estelle).
Or–different approach to gold here–how about Glimmer and Gleam?
Are they mischieveous? Flicker and Flare? Frick and Frack? Snickle and Fritz (okay, I admit that last doesn’t work for a girl).
Go Welsh? http://www.babynamenetwork.com has a whole list of Welsh girls’ names.