Nexus 7 is one of the popular tablet device among Android users. As an Android device, the possibility of customization on Nexus 7 is huge. You can use widgets, launchers, themes and other personalization apps from Google Play Store to make a desired setup.
Also, you can root your Nexus 7 and unlock it to install totally different ROMs like CyanogenMod and MIUI. These ROMs not only gives the device more customization options but also gives the device boost in performance. CyanogenMod have Theme Chooser app which allows you to change the System Interface using custom themes while MIUI also have its own themes app.
Alternatively, you can use Icon themer tweak for Xposed framework which works just like Winterboard on iPhone. You can use it on any ROM, the only thing is you need a rooted phone.
While surfing, I came across a community of Nexus 7 owners. The community is the place where Nexus 7 users post their homescreens and customizations. I really liked some of the customizations and wanted to feature them here.