I love Ember! Lawrence... maybe. I prefer it as Laurence and as a mn, but it's good. My only issue is that Ember has so much personality that she makes Lawrence look like a boring old geezer, whereas something like Elizabeth would bring out his hidden qualities. I know the contrast is part of the appeal of the sibset, though. Maybe it would be different if I liked Lawrence more to begin with.
I like Lawrence Isaiah, and Ember Corinne is good. I'd also like Ember Corina, Ember Corinna, or Ember Karina. For some reason I prefer the mn's with "a"s on the end... no clue why :P