2

It's hardly any productive idea more like aesthetic one but I still think it's worth posting.
It would be cool if we can in Oxygen theme:
1. Turn off gradient entirely.
2. Choose between vertical, radial or horizontal gradient.
3. Make Window decoration color diffrent than window background color.
4. Setup diffrent color for toolbars and menubars than window background. But this is at least for me low priority.
5. Set scrollbar separately, from buttons color. It nice it all blends togather but sometimes it really hard to guess where the scroll bar actually is.