1.

Windows 8 GTK+ 1.6 - >= 3.18

GTK3 Themes by sinner59
Windows 8 modern UI (metro) gtk3 (+gtk2) theme.Please rate it if you like or/and uses ! (consider this as a flat theme artwork simply, nothing more).Metacity theme, with 16 colors is here: http://gnome-look.org/content/show.php?content=157024 This is my very 1st gtk+ theme creation.
29 comments
Score 74%
74 Likes
26 Dislikes
5 hours ago
2.

Elementaryfix 1

GTK3 Themes by darkomarko42
this is the elementary loki theme by default but the gtk2 is more like the gtk3
Score 50%
50 Likes
50 Dislikes
6 hours ago
3.

Breeze-Psion 0.5

GTK3 Themes by phob1an
This is an ugly hack of Breeze to fit my Psion Plasma theme https://www.opendesktop.org/p/1235613/. Full credit goes to the original author(s).
1 comment
Score 50%
50 Likes
50 Dislikes
1 day ago
4.

Dark Aurora 3.28

GTK3 Themes by bolimage
Easy On The Eyes Gnome 3.28 theme.
Source Code
9 comments
Score 67%
67 Likes
33 Dislikes
1 day ago
5.

Ant Themes 1.1.0

GTK3 Themes by eliverlara
A flat and light theme with a modern lookInstallation: 1.- Extract the zip file to the themes directory i.e. ~/.themes/ or /usr/share/themes/ (create it if necessary). 2.- To set the theme in Gnome, run the following commands in Terminal (i.e Ant theme). gsettings set...
225 comments
Score 72%
72 Likes
28 Dislikes
2 days ago
6.

Qogir theme 1.6

GTK3 Themes by vinceliuice
Qogir is a flat Design theme for GTK 3, GTK 2 and Gnome-Shell which supports GTK 3 and GTK 2 based desktop environments like Gnome, Unity, Budgie, Pantheon, XFCE, Mate,...
37 comments
Score 71%
71 Likes
29 Dislikes
2 days ago
7.

BeOS R5 1.0

GTK3 Themes by elbullazul
GTK theme based on the appearance of the last iteration of BeOS (R5) Requires the Murring GTK 2 rendering engine and GTK 3.20 or higher to run correctly.
Source Code
8 comments
Score 50%
50 Likes
50 Dislikes
2 days ago
8.

Red Breeze Dark GTK 2.0/3.0 theme 1.05

GTK3 Themes by Ennai
It's a darker version of the original Breeze Dark with red instead of blue. It works on GTK 2.0, 3.0, 3.18 and 3.2. I tried it on Gnome and KDE Plasma, it works well. See my profile for more Red Breeze Dark themes.
1 comment
Score 54%
54 Likes
46 Dislikes
2 days ago
9.

Griffin Brave Flat 3.2

GTK3 Themes by Shenron
A modern GTK theme that will transform your Linux Desktop and give it a modern flat look. *Available Packages: -- Gnome Shell theme -- Xfwm4 theme -- Metacity Theme --Openbox theme --Cinnamon Theme Please......vote/rate if you like this theme, thanks!! Installation: 1.- Extract the tar.gz file...
Score 50%
50 Likes
50 Dislikes
2 days ago
10.

Flat Remix GTK theme 1.5

GTK3 Themes by daniruiz06
Flat Remix GTK theme is licensed under the GNU General Public License v3.0 Theme based on Arc theme by horst3180 https://github.com/horst3180/arc-theme## Please up vote or press the plus sign to show your support.# Web Page: https://drasite.com/flat-remix-gtk# Github:...
3 comments
Score 60%
60 Likes
40 Dislikes
May 17 2018