When I installed Skype, it used default qt theme instead of my gtk theme. After installing emul-linux-x86-gtklibs, Skype picked up correct gtk theme. I think, emul-linux-x86-qtlibs should have "gtk" use-flag with conditional dependency on emul-linux-x86-gtklibs to avoid theming problems.
+ 16 Nov 2012; Pacho Ramos <pacho@gentoo.org> + emul-linux-x86-qtlibs-20121028.ebuild, metadata.xml: + Handle gtkstyle as x11-libs/qt-gui does (#443474 by Alexander Mezin). +