add simple architectural trim to the existing room without changing anything else add a 5 inch tall baseboard along the bottom of all walls in the room the baseboard should be simple clean and straight with a subtle traditional profile add a simple ceiling trim crown molding where the walls meet the ceiling keep the ceiling trim minimal and understated with a clean simple profile not ornate or heavily decorative continue both the baseboard and ceiling trim consistently around all applicable walls and corners make the trim look properly built into the architecture with realistic proportions shadows and transitions at corners match the trim s finish to the existing painted architectural elements in the room do not change the walls ceiling flooring windows furniture materials colors camera angle or room proportions only add the 5 inch baseboard and simple ceiling trim