I tried to use the oxygen-gtk theme on ubuntu 12.04, but it didn't work properly, only the menus. The windows looked like win95/98 :D I know that the best way to use that is to use Kubuntu, but I found it really buggy... So, is there a way to use that theme on Unity?
I think i found something similar, a person with the same problem as you asked this question a while ago. Check it out here: KDE theme in Ubuntu Unity , if it helps.