If you are a Microsoft Windows 7 User then you can download this Transformers: Dark of the Moon Theme for your PC via Microsoft Official Website.
In terms of a Windows Theme, the Transformers 3 Theme is pretty disappointing. We only get 10 Desktop Wallpapers. No Unique Sound Effects, No Unique Screensaver, No Unique Color Scheme… just a set of Wallpapers.
You can download the Theme here.