[jtcrusader]

I have found a great deal of information on this site, and am about ready to try to download and install one of the themes that are out there (I really like Torx' iPhone themes). However, BEFORE I do any of this on my Alltel HTC Touch/Vogue, I have a couple of questions:
1. What will changing or installing a new theme do FOR my phone in terms of functionality? (I know they look cool).
2. Do they really ease operation. I utilize Spb Mobile Shell right now.
3. Will this involve messing with my ROM? I am happy with the new Alltel ROM with 6.1 and GPS activated.
4. Can these brick my phone in any way?

Thanks, in advance.