How to get the Android L look on a Nexus 5 or another KitKat phone
Unlike other Android smartphones, the Nexus 5 was made to be tinkered with, so rooting and "Xposing" it is pretty much an essential experience. But if your Nexus 5, or another smartphone is still in stock mode, peruse a guide on rooting it, and embark on an Android customization extravaganza with Xposed. And if your phone isn't a Nexus 5, install the Google Now launcher from the Play Store beforehand.
All set? Let's get to it! After you've enabled app installations from Unknown Sources, your first step is installing Xposed GEL Settings. Launch it from the app drawer and reach for the side navigation menu to the left. Go to the General section and check out the L Launcher Design option. Yep, that's the one you want! Turn it on, mark the box next to "Don't show again", and tap "Got it!".
If you followed every instruction so far, that's pretty much all it took! Enjoy the L Version-like experience, and consider installing the Android L Theme module for Xposed from the XDA Developer forum. It will introduce all the themed status bar icons, settings, calculator, wallpaper, boot animation, fonts, and ringtones you need to fool everybody you're running Android L Version.