I got some ideas for branding..
Pale Moon could be called Whistler after the Codename for Windows XP
Basilisk could be called Freestyle the Codename for Windows XP Media Center Edition because of the extra media features and Australis UI
Borealis could be called Neptune the Codename for a developmental predecessor of Windows XP
Interlink could be called Lonestar the Codename for Windows XP TabletPC Edition (writing, email, get it?)
These are all UXP based applications for Windows XP and there you go a theme for all your forks of them.
OH just call Basilisk 55, call it the codename for the repo.. Moebius/Mobius. Good name at any rate.
Again for the four UXP applications.. I am willing to do the work for you, get em all in one repo, do the branding (yes I will keep the appdata paths as they are to avoid profile issues) and gift wrap it for you for Christmas.
What do you say?
EDIT: Thank you for removing the official branding from the modified-uxp repository.
ALSO, if you go forward with this I will list you on thereisonlyxul.org in a special section for Windows XP users.