/usr/share/themes/Simple-Generic/ is in openbox-themes 1.0.2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/themes/Simple-Generic/gtk-2.0/
/usr/share/themes/Simple-Generic/gtk-2.0/gtkrc
/usr/share/themes/Simple-Generic/openbox-3/
/usr/share/themes/Simple-Generic/openbox-3/bullet.xbm
/usr/share/themes/Simple-Generic/openbox-3/close.xbm
/usr/share/themes/Simple-Generic/openbox-3/desk.xbm
/usr/share/themes/Simple-Generic/openbox-3/desk_toggled.xbm
/usr/share/themes/Simple-Generic/openbox-3/iconify.xbm
/usr/share/themes/Simple-Generic/openbox-3/max.xbm
/usr/share/themes/Simple-Generic/openbox-3/max_toggled.xbm
/usr/share/themes/Simple-Generic/openbox-3/shade.xbm
/usr/share/themes/Simple-Generic/openbox-3/themerc