When I go to 'Wine configuration - Desktop integration', there is no simple way to use my current theming of Ubuntu.
I have only options of 'install theme' (it's a windows file? where I can get it?!) or manually set each item color, and each time when I change Ubuntu theming, I must again and again set each item in Wine manually.
I suggest to integrate Ubuntu theming in Wine. It looks not so hard.
Developer comments
The problem isn't Ubuntu specific: Wine's theming implementation still sucks. This is largely an upstream issue (there was a summer of code project at one point, but it didn't fix the slowness, and it didn't add any good magic to use the current system theme colors).