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Here's the home screen rotated into landscape thanks to Apex Launcher.
Jelly Bean home screen
Fancy Widgets and standard Jelly Bean Home Screen
This is the standard Nexus 7 Jelly Bean home screen. The weather/clock widget is Fancy Widgets.
Ultimate Rotation (7-day free trial available)
For those who don't want to root the Nexus 7 or even install a replacement launcher, Ultimate Rotation allows rotating the home screen (and other functions) using the standard Nexus 7 Jelly Bean launcher.
Here's the last home screen rotated into landscape.