[psooky]

For the most part, any CDMA ROM will work with your TP. Some ROMS are made for specific carriers, but it should say in the title or in the first post of the thread.

Unlocking/Flashing is actually very easy, but it can be scary your first time since there are several new acronyms and such you probably wouldn't have heard of before.

Read the sticky about unlocking/flashing, cross your fingers and search, and if you still don't have the answer, post the question.

As far as the theme you posted pics of, I think it was a demo of WM 6.5, so the pic in probably in a lot of cook's kitchens. You need to install a cab (or do a reg edit?) to get the honeycomb look, but otherwise it is an ordinary 6.5 ROM.

6.5 vs 6.1 is really a matter of personal preference at this point. I like 6.5 just for the smoother finger-scrolling, but YMMV.

And good luck flashing! It becomes very addicting.