Livid is a properly grown-up teal-grey, and the trick with it is to lean into that coolness rather than fight it. The clean move is a chalky, neutral white on the trim and ceiling — Farrow & Ball All White (LRV 92) is about as honest a white as you'll find, no yellow undertone to muddy things, so the contrast stays crisp and the room feels calm rather than clinical.
For hardware and metalwork, stick to slate and nickel. Yellow brass clashes with Livid's blue-green and makes the whole scheme look like it can't decide what it's doing. Polished or brushed nickel reads cleaner and lets the teal do the talking.
Where it gets interesting is the accent. A room of cool teal-grey can tip towards flat, so it needs one deliberate second note. Paint & Paper Library Blue Blood (LRV 16.4) — a deep, inky navy with a cool green-grey undertone — is the moody route for a chimney breast or joinery, while Dulux Fuchsia Falls 2 (LRV 29.8) brings a bright, cool magenta-pink punch for cushions, a feature door or a smaller adjoining space.
If you want to break the cool discipline deliberately, Mylands Beehive Place No.140 (LRV 58.6) is a golden, honeyed yellow — best in an adjoining space or inside shelving, where it reads like a shaft of sun against the teal rather than a fight with it.
The "but what about warmth?" question is the one everyone asks — and the answer is texture, not yellow. Bring it in through timber, leather, and a wool rug rather than warming up the paint itself. Keep the painted surfaces cool and let the soft furnishings do the heavy lifting.
Practical tip: paint a big A2 board in Livid and stand it against your chosen white and accent in the actual room. North-facing light will deepen Livid considerably, so test it where it'll live before you commit the whole scheme.