gruvbox-gtk-theme : A GTK theme based on the Gruvbox colour palette. ( https://github.com/Fausto-Korpsvart/Gruvbox-GTK-Theme )
gruvbox-material-gtk-theme : Gruvbox Material theme for GTK ( https://github.com/sainnhe/gruvbox-material-gtk )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a thegreatmcpain
For Paludis use this rsync : rsync://gentoo.zugaina.org/thegreatmcpain-portage
If you have a problem : ycarus(-at-)zugaina.org