Turkbey ROM is a very highly-themed ROM that comes with custom icons, font, and a kernel that’s overclockable to 1.6Ghz. The battery life is pretty awesome on this ROM but what you will find exceptional over other custom ROMs is again its custom theme. It also comes with an app to change various things like the Lockscreen, toggles, and more.
At 1.6Ghz on performance, this ROM gets over 6000+ on Quadrant, which is pretty fast.
So, give it a try if you have an AT&T version of Galaxy S2, you will like this one.