A beautiful theme that comes with many variations of accent colors and light/dark modes.
Cuspair Gruvbox
Gruvbox Material theme for GTK, Gnome, Cinnamon, XFCE, Unity and Plank.
Cuspair Everforest
The idea was born from the need for GTK themes that match the most prominent colour palettes of Neovim code editor and Tiling Window Manager, such as Xmonad, Awesome, DWM, etc, which use these colour schemes to give a uniform and unique look to working environments.
Cuspair orchis
Orchis is a flat style gtk theme for Gnome/Gtk desktop.
Cuspair pop
Cuspair GTK+ airson Pop!_OS
Cuspair Skeuos
Dark/Light theme with multiple accent colors.
Cuspair Layan
Layan 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, Budgie, etc.
Cuspair milis
A sweet theme for TROMjaro 
Cuspair Lochlannach
Nordic is a Gtk3.20+ theme created using the awesome Nord color pallete.
Windows 10 Cuspair Dorcha
GTK theme based on the appearance of Windows 10 using the included dark mode.