Is there an equivalent to iOS "Reset Home Screen Layout" on the Nexus 7? On iOS, "Reset Home Screen Layout" auto-arranges your application icons.  Is there an equivalent for this on my Nexus 7 Android tablet?  Right now my icons across several screens.
Go to Settings->Apps, swipe to All, scroll and press Launcher, then select Clear data.

Your home screen is as good as new :)

UPDATE: As suggested by Chahk below, a good way to avoid cluttering your homescreen is by going to the Play Store then going to Menu -> Settings and un-checking the Auto-add widgets option.