title: Emacs: how to get the default theme?
body: <p>I've been using the default theme with about 10 faces changed via
  <code>custom-set-faces</code> for a while now.  But from time to time I want to
  try out a couple of the custom themes out there.  The problem is that
  they set much more than 10 faces and there's no way to get back to my
  previous setup once I've loaded a custom theme.</p>
  
  <p>Just to clarify:</p>
  
  <ol>
  <li>I start Emacs with my customization of the default theme <code>(load "faces")</code>.  All is good.</li>
  <li><code>load-theme</code> <code>wombat</code>. All is good.</li>
  <li><code>(load "faces")</code> again: everything is a mess, because a lot of the faces still remain
  in the <code>wombat</code> state.</li>
  </ol>
  
  <p>Sometimes separate themes aren't compatible with each other,
  e.g. second one sets more faces than the first one and when
  returning to the first one everything becomes a mess.</p>
  
  <p>So I wonder if there's something like <code>load-theme</code> <code>default</code> that
  would reset every face imaginable to the default <code>emacs -q</code> state.</p>
  
  <p>I could then just tweak it with my 10 custom faces and have my own
  theme that would not have the problem that I described.</p>