The themes are based on good ol' Clearlooks, Clearlooks-Phenix and TraditionalOk from the mate-themes package with certain excerpts from the glorious Mint-X theme. Some minor bugs of the original theme were fixed here. The colors are carefully picked to be easy on the eyes and generally eye-candy. Openbox themes in Greylooks are designed to be consistent with the corresponding GTK themes. The themes are overall Gruvbox- and Redshift-friendly.
Just install the theme directories into your /usr/share/themes
(for systemwide installation) or ~/.local/share/themes
(for local install) directory.
In order for the GTK2 themes to be working, it is necessary to install the gtk-engines
or gtk2-engines
package (depending on the distribution).
GTK and Metacity themes share the original LGPL v. 2.1 license of the mate-themes package. Openbox themes are under the GPL v. 2.0 license.