If you want to completely re-vamp your phone into something else, you might want to give MIUI ROM a try, this ROM basically strips TouchWiz UI completely and puts a new MIUI user interface.
I’ve used MIUI ROM on other Android smartphones before and I have to say this is the best ROM if you are a theme-switching addict. The ROM comes with a free theme switcher with hundreds of free themes that lets you switch themes on the go.
Try this ROM and let me know what you think!
Don’t know how to install a new ROM? Look here.