https://bugs.winehq.org/show_bug.cgi?id=34181
--- Comment #8 from marc marcdunord@gmail.com --- i installed "in the dark" as advised by rosanne and it works great.
it took some time figuring out the steps though:
i) downloaded theme (file: InTheDark.msstyles) from website indicated by rosanne ( http://customize.org/xpthemes/60033 ).
ii) copied it to /home/username/.wine/dosdevices/c:/windows/Resources/Themes/
iii) went to "wine" -> "configure wine" -> "desktop integration" -> clicked "install theme" to browsefor+click on the InTheDark.msstyles file.
iv) chose InTheDark as theme
v) clicked "Apply" and "OK" and done.
NB. it would be nice if wine developers included a default dark theme right away, since it's a bit stressful to find and choose one (multiplied by 100,000+ wine users!).