That's great.
I've been testing oomox in Manjaro Budgie, and the materia/numix-based themes I've generated work very well in gtk3-based DE like Gnome or Budgie (or generally gtk3 programs).
However, when I compressed (ie, created archives of) the themes to save them, and then tried them out on gtk2 XFCE in MX17 and an older (but fully updated) Manjaro XFCE install, I found that the themes didn't work on Thunar and other elements of XFCE (e.g. the Appearance Settings window) so I was getting the ugly "Windows 95" look on these. Strangely enough, the theme looked ok on Geany, which I thought was purely gtk2.
I can't figure out whether it's because the themes only work on a system with the same gtk2/gtk3 version as the system oomox was run on (but that doesn't explain it not working on Manjaro XFCE), or it just doesn't work on XFCE-gtk2, or perhaps creating an archive of the themes messed with some symlinks or some file settings, or what.
Would be interested to try generating themes for MX17 on a version of oomox that actually runs on MX17, to see if it makes a difference.