I've looked at changing themes for communities, and it seems like that it is impossible to do from the standard ELGG implementation.

I think it is a bug, because the functionality is there from a database perspective! (Communities are normal users, and users can be assigned specific themes / templates)

So this is a call for a change:

We move the theme change functionality away from account settings and over to profile, as it is possible to change profiles for both users and communities.

I'm open for other places to put this funcctionality, but something needs to be done. The default theme is not the best, hence should not be the theme for all communities…