Stock or aftermarket two tone?
Stock two tone is fine. But if you zebra pattern the seat and door cushions and carbon fiber overlay the center console, then the number of interested buyers will drop dramatically. There's a GPW with a wood grain overlay center console that's been on the market for an eternity. Though it seems an easy fix, the mod also makes me wonder if the owner had the sense to care for the car in other ways if he's willing to mickey mouse his bubbled console with fake wood.
So yes, it decreases the car's value unless the stock interior was absolutely destroyed to begin with.