It really surprises me that there isn't a Dark Moon insignia given how big the EC 3D Custom Girls community is, you think that would be pretty big... Well, if things go well with the attempt to bring Sailor Moon back we'll see... Another possibility would be a costume transformation, I seem to remember a really nice story of Rico's with Esmeraude wearing a custom fuku, though I'm not sure if you would be able to do custom fukus...
Anyway, some Harpy stuff~ Here's the Pixiv page
http://www.pixiv.net/member_illust.p...st_id=15969548