Oxygen rewritten in adwaita code.
I recommended you to use the gtk2 oxygen theme from your platform.
The current gtk2 version is only a placeholder
Everything that is not gtk3 inside the pack seems to be from:
,Kim Kahns Just included their artwork here to make it easier for you to set up this theme.
0.9b: changes in scrollbars, tabs and headerbar close buttons as well as mate panel
Added a Cinnamon Edition