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The top two widgets in this screen are both from Beautiful Widgets, which allows customization of the clock and weather info on the home screen.
There are hundreds of free skins to download within the settings to make your Nexus 7 home screen your own.
Beautiful Widgets handles screen rotation beautifully, as demonstrated in this landscape screen.
Note that home screen rotation was possible due to the Ultimate Rotation app.
Another clock/weather widget is Fancy Widgets. While not as many skins are available as in Beautiful Widgets, this one is quite good for customizing the appearance of the Nexus 7 home screen.