I've at the moment pushed the base work make Adwaita mostly depend on named colors, and to disociate the color scheme used in the theme from the one provided through GtkSettings.

I'm already looking into producing high/low contrast variants after this ground work

Got to this later than desired, due to work trips and such... I've now pushed lowcontrast/highcontrast/inverse themes. 

It's now only missing a dark variant, but I think that's more stylistic, which I don't really feel qualified for. So it'd be great to have at least some mockups in place.

Ok, I've filed a separate bug for remaining work on a11y themes, retitling this one for the dark variant.

[Removing GNOME3.0 target as decided in release-team meeting on March 03, 2011. "nice-to-have" categorisation for GNOME3.0]

This depends on changes in mutter and probably on GTK+, which should signal to the WM to switch to a dark variant theme.

(In reply to comment #5)
> This depends on changes in mutter and probably on GTK+, which should signal to
> the WM to switch to a dark variant theme.

Not really. This bug is about a dark variant for the GTK+ theme, not a matching variant for the mutter/WM theme.

(In reply to comment #6)

> Not really. This bug is about a dark variant for the GTK+ theme, not a matching
> variant for the mutter/WM theme.

It has been pointed to me that a dark GTK+ theme variant would look bad with the regular WM theme, as the titlebar "blends" with the menubar color.

Indeed, also the bright titlebar (and bottom border) on the dark widget theme will look even brighter taking all the attention hence defeating the purpose of the dark variant.

I implemented a first iteration of the dark variant in git master.
It still needs the WM theme part and correct colors, so I'm leaving this open.

Jakub went over the colors, which are in git master (which is targeting 3.2 now).
The WM part is in https://bugzilla.gnome.org/show_bug.cgi?id=645355, so this can be closed as fixed now.