At the moment, these themes are currently intended to be used with Xfce4, since that's what I use. If you run into problems in another desktop environment, I'll try to help the best I can though.

Relevant license files can be found underneath the folders. (Numix is GPL-3, Xfwm4 is GPL-2, Plank themes and build system are ISC)

Included

GTK 2 and 3 themes
Xfwm4 themes
Plank themes

Downloading

Either use git to clone this repository:

git clone https://github.com/Somasis/shiki-colors-revival

or just download the latest release.

Installing

Open a terminal in this repo's directory.
make, or run make help to see what else the Makefile can do.
make install as root

Exherbo users: There is an exheres in ::somasis; x11-themes/shiki-colors-revival.

How this works

In order to minimize the amount of maintenance needed, we base these themes off of Numix so that we benefit from the shimmerproject's work on Numix. The themes are then generated by using regular expressions to replace certain variables in the CSS to change the colors to fit the GNOME Colors palette rather than using Numix's default colors. (currently only the selected background color is replaced)

As a result of doing it this method, we don't have to worry about updating the CSS every time GNOME's developers decide to break everything with a new minor version of GTK3, again. We can make upstream do all the work. :)

Current problems

I'm still learning GTK, and GNOME developers, for some god-only-knows-why reason they decided to provide pretty awful documentation.
Eventually this will stop working since GNOME developers will probably think that GTK 3 on non-GNOME environments is deprecated or something, and not worth their support. It's probably better to use Qt in the future.
It doesn't look exactly like the original theme; part of this is intentional, part of it is that the theme looks better, to me, than the original one.

Credits

Numix by shimmerproject
Shiki-Colors-Xfwm by fredbird67, modified by myself