If you are looking to completely alienate your Galaxy S2 Android smartphone, you might just want to try the Alien ROM, which comes with its own custom “Alien” theme, I kinda like it as it gives you a feeling of having a custom Galaxy S2.
This ROM comes with an overclockable kernel (up to 1.6Ghz) and lots of custom stuff.
Try it out and let me know what you think.
Don’t know how to install a new ROM? Look here.