MixtureD theme has released version 2.0 that finally brings support for Gnome Shell version 3.6 that most of you will probably be using right now. A version for GS 3.4 is still available though.
MixtureD combines blue and white colors in an elegant and clean result, that provides an ideally modern and relaxed desktop environment that is suitable for everyday use.
This theme also includes the icons and the wallpaper that you see in the above screenshot. There is also an installation and uninstallation script available, but it didn’t work for me. If it doesn’t work for you too, you can manually place everything where it is supposed to be. For more details about this, you should read our guide on how to theme Gnome 3.