This is for those who have tried changing their LCD density and may have run into issues (myself Included). This new app developed by XDA Member ex87 allows you to change LCD density on the fly without modifying the build.prop file, which can lead to issues. The app is featured in this video.
The app works by changing the density in the system, so the changes you make will not survive a reboot. So, if you do have an issue with the app causing your phone to break, a simple reboot/battery pull will fix the problem. When you’re changing densities, the phone will look like it has crashed but it is really reloading the Android software stack, which will play the boot animation while it makes the changes you requested.
To download the app, check out the discussion thread.