Gnome 3 themes, user overrides?

[Michael Welsh Duggan <md5i md5i com>]

So, Gnome 3 uses a form of CSS for its theming.  I'll go ahead and give
it a good solid plusplus for that.  Easy, understandable customization.
Or at least one would think.  So, CSS being the nice cascadey thing it
is, I should be able to override a theme by placing something in a
specific location in my home dir, right?  But every reference I find
online suggests modifying the themes in /usr/share/themes/ directly...
Is this right?  I hope not.  If it is this way, this seems like a huge
oversight.

In my case, I am using nautilus on my desktop.  But the Adwaita theme's
text color doesn't show up very well on my background.  So I thought I'd
modify it.  And that led me to writing this post.  Any ideas?

-- 
Michael Welsh Duggan
(md5i md5i com)