I now have 95% of the fireplace complete! The only things remaining are the decorative ledge, painting the brass bars, and caulking and painting around the mantle.

Just to remind you how bad it was before:

Semi Finished-After:

Close up on the subway tiles (these were not nearly as easy to install as I had hoped, but they do look amazing):

I used some of my mistinted paint to change the color of the mantle. Once it was distressed it matched the rest of the mantle perfectly! It was previously a yellowy-butter color, and this accents the tiles much better:
Now on to the floors!!!