This is clone of gnome3 Adwaita theme It is tuned to work with GTK-2 application exactly as with GTK-3 There is still minor issues, but work in progress

• go to the themes folder: $ cd /usr/share/themes
• clone theme's repo: $ sudo git clone https://github.com/axxapy/Adwaita-dark-gtk2.git Adwaita-dark
• for versions of gnome-shell <= 3.12 switch to 3.12 tag: $ sudo git checkout gnome_3.12
• launch gnome-tweak-tool
• go to Appearance section
• change "Window" and "GTK+" themes to Adwaita-dark

• Open gnome-terminal
• go to Edit->Preferences menu
• select "Use dark theme variant" checkbox

• Open gedit
• go to Preferences (by clicking on the name of application in the top panel of gnome-shell)
• Open tab "Font and Colors"
• Select any dark theme you like (I prefer Oblivion)

originally cloned by Roi M (https://plus.google.com/+RoiMMrNucky/posts/KsybAs8Htgc) tuned and updated by axxapy