In the past, adding surface shots of Alderaan's destruction has been discussed. While re-watching Serenity, I realized that there's a brief clip in the beginning that could be useful:

http://disparue.org/gallery/4/movies/starwars/3/images/starwars3_4681.jpg

http://disparue.org/gallery/5/movies/serenity/film/images/serenity_0026.jpg

Sure, the architecture's less rounded, but it still looks evocative of Alderaan to me, if perhaps another part of the planet, or maybe a civilian/industrial sector as opposed to the capital seen in ROTS. The sharper buildings even sort of fit with the idea of the galaxy becoming a more rugged, weathered place.