Comment 6 for bug 863218

Well I can reproduce this on my 12.04 final system with skype-bin:i386 2.2.0.35-0precise3.
Workaround by dmitry works as expected but is no good solution.
Better description of the bug: QGtkStyle tries to find the current gtk theme but is not able to do so and falls back to clearlooks. This applies to all 32bit Qt applications on a 64bit system. I believe QGtkStyle uses libgnomeui to find the correct GTK Style but is not able to do that because the lib is only available in 64bit form. Trying to install the i386 version will replace the 64bit version. The other problem is that QGtkStyle also expects the GTK Theme Engine to be in 32bit, so you have to install gtk2-engines-murrine:i386 for the default light-themes.