You might fed up with the standard home screen. Tons of Android apps can help you customize your device's skins. If you want to transform into 3D interfaces and 3D animations without rooting, a launcher app is what you are looking for.
SPB Shell 3D is full of polish and runs great on N7, but makes something super slowly, such as dragging and resizing, Folder animations. However, it is lacking some features, like a backup option for wallpapers and screens, more animations and a persistent Google search widget.