Darqlassic

Source (required if based on other people's work):

Score 56%

Description:

A very simple darker modification of the standard theme for Gnome 3.16.

To change the color palette, simply play with colors in gnome-shell/gnome-shell-sass/_color.scss and generate css by running

sass --sourcemap=none --update .
in the gnome-shell folder.

When having User Themes extension installed, you can do this directly in your ~/.themes folder and run rt via Ctrl-F2 to reload the theme immediately.