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There are many whimsical skins available for Beautiful Widgets such as this Blackboard skin used on both the clock and weather widgets.
The Friendcaster app is a Facebook app replacement that takes good advantage of the big Nexus 7 screen. It installs a widget that works nicely for keeping up with Facebook friends on the home screen.
Another clock/weather widget for the Nexus 7, HD Widgets is my favorite as it has several different sizes to choose from.
Everything on this widget is customizable to make it just right. HD Widgets handles screen rotation nicely, as demonstrated in this and the following screen.