Re: Custom themes

[Richard M. Stallman]

    Some questions and remarks _were_ naive.  At second look
    `customize-create-theme' seems to be a user level command rather than
    a Lisp programmer level command, as I first thought.  Trying it out,
    it seems to have a very unfinished look to it.  I still do not really
    know what it is exactly trying to do.

I don't remember the details, but it is a matter of defining
a collection of custom settings and giving them a name.
Then you can enable them and disable them by name.