Looking for an interesting ROM that does a LOT? Well, check out the CHAOS ROM for your rooted Galaxy S3 GT-i9300.
Based on Wanam Lite ROM (which I love also), the CHAOS ROM brings you FOUR different launchers including Xperia Z, Sense, TouchWiz, and Nova.
Of course, you do not have to install all of those launchers, you can use its AROMA graphical installer to your liking. The AROMA installer on CHAOS ROM also provies 5 different themes, stock, JB Domination, Sense, HoneyComb, and Xperia (you can watch the video overview for the whole AROMA installer walk-through). By utilizing your favorite theme and launcher, you can easily turn your Galaxy S3 into an Xperia Z, HTC, or pure Android.