While your client may think that it's best to follow certain design rules, sometimes suggesting that they break them can make for an even more exciting project. Yanic Semard at HOUZZ gives seven design rules and how to break them to give a room a different feel and avoid being predictable.
One of the rules that can be broken is that tile is only for kitchen and bathrooms:
This seating area really proves that tile can be a stunning feature outside of functional areas like a kitchen backsplash. The dark yet reflective surface of this simple subway tile makes a stunning feature wall, and proves once again that dark colors can be beautiful in a small space.