Do you have Unity Pro? This could be done fairly easily with Pro, [see these](http://answers.unity3d.com/questions/348781/blur-window.html) two [unityAnswers posts](http://answers.unity3d.com/questions/364410/lerp-blur-effect-unity-pro.html) for more info, and [this Unity documentation](http://docs.unity3d.com/Documentation/Components/script-BlurEffect.html) about blurring images.
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