I started to watch Flipping Out on Bravo how noticed that it wasn't really about design but really about Jeff Lewis literally flipping out. If you can get pass the drama of the show, he's very talented and creates beautiful homes.
Using black and marble tiles among the white subway tiles, breaks up the monotony and gives the bathroom a sophisticated feel.
Take a look at his bathroom designs, although they're very luxurious you can adapt his designs for a reasonable prices especially using the designs with the white subway tiles.
The sink is not really something I would use in my home, but it is really a conversation piece.
He uses of browns and white gives this bathroom a timeless and sophisticated feel.
Here's another example of using a small amount of decorative tile with subway tile.
Here's a beautiful use of wainscoting which is also a cost effective way to renovate a bathroom.