One of the coolest new features in Android 4.2 was multi-user supports. The feature is only available for tablets, although a bit of modding will enable it for phones as well. The new easiest way to get multiple user accounts enabled is the Modaco Toolkit, at least on rooted phones running Android 4.2.
First, you’ll need to download and install the Xposed Framework, which is a fairly new tool for Android developers to add tweaks to system framework. The Modaco Toolkit is a module for the Xposed Framework. Installing the Toolkit will enable all of the multi-user options after a reboot. This mod definitely works on AOSP 4.2 ROMs,but no word on if it’ll work on skinned versions of Android. Hit the links below to test it out on your rooted device, after making a backup, of course.