Oomox is a graphical application for generating different color
variations of a Numix-based and Flat-Plat themes (GTK2, GTK3),
Gnome-Colors and Archdroid icon themes.

Note:
You may specify alternate versions of the oomox-gtk-theme and/or
Flat-Plat theme by passing OOMOXVER and/or FLATPLATVER variables to the
script, for example

  OOMOXVER=1.2.8.1  FLATPLATVER=20170917  ./oomox.SlackBuild

but you will need to manually place the corresponding tarball(s) in the
slackbuild directory.