Wow, thanks for all the great responses, everyone! When I have some more time I'll come back and post my favorites. You all rock! =)
OK, here are my faves:
Aurora Elin (spelled this way rather than Ellen)
Aurora Daphne (is this too mythological of a combo, though?)
Aurora Celeste (too sky-related/hippy?)
What are your favorites from this new short list?
Blythe, Claire and Noelle are my favourites :)
Elin is quite common in Scandinavia, and here it's not pronounced like Ellen at all so that seems a little unnatural to me. You can listen to it here: http://www.forvo.com/word/elin/#no
Ditto... Blythe, Claire, and Noelle are my favorites, too!