I've tested and tried many GTK+ Themes, but found the one that ease on the eyes the most is still the oldest CDE-Solaris Theme:
I believe this color combination has been carefully engineered exactly for the purpose to make people comfortable staring at the monitor for a prolonged time, and apparently more people agree with that:
This is definitely one of the best themes around.
However the CDE-Solaris Theme I am able to find is only available in GTK2.
Anyone knows if a GTK3 version is available somewhere? If not, is there any GTK3 Theme that is close to such color combination? (I'm not interested in the shinny bell&whistles that comes with the theme, but its color combination instead). Thx.