SensatioN ROM for Samsung Galaxy S II is another custom firmware that you can try on your Samsung Galaxy S2. It has a nice user interface – SensatioN 2.0 theme. I like its transparent dropdown menu, redesigned dialer and using JKay Theme (you can modify lockscreen, phone power menu). SensatioN ROM v1.5 is based on the latest XXKH3 firmware, Ninphetamine 2.0.5 Kernel and deodexed & Zip-aligned. Samsung hubs were removed and using TwLauncher v4.5.
Installation guide ~ How to install firmware on Samsung Galaxy S2 with ClockworkMod Recovery?
Download SensatioN v1.5 CWM ROM here.