A theme for GNOME and Xfce4.
Canta Theme
Canta is a flat Material 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, etc.
Qogir Theme
Qogir is a flat Design theme for GTK
Stilo Theme
Minimalistic GTK themes
Sardi Icons
Circle-style and minimalist icons
Vimix Theme
Vimix is a flat Material 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, etc.
Matcha Theme
Matcha 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, etc.
EvoPop Theme
EvoPop is a modern desktop theme suite.
Arc Maia Theme
Arc is a flat theme with transparent elements for GTK 3, GTK 2 and GNOME Shell which supports GTK 3 and GTK 2 based desktop environments like GNOME, Unity, Pantheon, Xfce, MATE, Cinnamon (>=3.4), Budgie Desktop (10.4 for GTK+3.22) etc.
Zafiro Icons
Minimalist icons created with the flat-desing technique, utilizing washed out colors and always accompanied by white.