How to expand the list of colors for the desktop background?

[Matthew Miller]

On Thu, Mar 19, 2015 at 08:02:30AM +0100, Joachim Backes wrote:
> I'm running gnome3, and I'm missing a feature to expand the table of
> colors which gnome offers for changing the gnome3 desktop background
> color (for example adding "black" to this table).

This is incredibly non-obvious, unfortunately, but you can set any
arbitrary color by bringing up the Colors table under backgrounds, and
then running Gimp or another GTK app with a color picker dialog and
dragging the color from that to the table.

I don't really understand why there isn't just a color picker there in
the first place. It's like a customization easter-egg!

-- 
Matthew Miller
<mattdm at fedoraproject.org>
Fedora Project Leader