Tranquil Dawn — Dulux's 2020 Colour of the Year — is a delicate grey-green that shifts depending on light, so the trick is choosing partners that anchor it rather than fight it.
Start with the woodwork. A soft warm white settles its cool edge beautifully. Farrow & Ball Au Lait (LRV 80) is a gentle creamy off-white that takes the chill off without going yellow, and Paper III from Paint & Paper Library (LRV 75.3) does a similar job with a touch more crispness. Either one stops the scheme feeling clinical. If you went pure brilliant white you'd make Tranquil Dawn look grey and cold — don't do it, mate.
For contrast and grounding, Mylands Cigar BH.20 (LRV 11.8) is a deep, smoky brown that gives the sage some backbone — gorgeous on a feature joinery piece, a kitchen island or the inside of a bookcase. The low LRV does the heavy lifting, so use it where you want weight.
Want a bit of life? Dulux Fuchsia Falls 2 (LRV 29.8) is the unexpected pairing — a dusky pink-purple that sings against the green without shouting. A cushion, an alcove, a single piece of furniture. Tranquil Dawn and a muted pink is a classic complementary play and it works.
On metals: this is your dial. Polished nickel keeps the whole thing cool, fresh and a little Scandinavian. Antique brass warms it up and pushes it toward a softer, more lived-in sage. Both are right — pick the mood you're after.
For the full quiet-sage look, layer Tranquil Dawn with limed oak flooring or furniture and a chalky off-white above. Keep textures natural — linen, wool, raw timber — and it'll feel calm rather than flat.
Practical tip: test it on every wall before committing. As a cool green it's very sensitive to orientation, and a north-facing room will read greyer and colder than a sunny south-facing one.