If you want a vintage fireplace with a modern twist, you should consider the contrast resulting from the usage of a cold, lifeless material like the concrete for the construction of a fireplace. That design move could surprise more than just aesthetically.
A concrete fireplace with a very interesting finish: an encaustic finish, a medieval painting technique (pigments in a wax suspension) which gives a most interesting patina is an excellent choice for an antique looking fireplace. You can also match your flooring to the concrete fireplace. (The fireplace pictured here was designed by Richard Beda)