Gray Owl is one of Benjamin Moore's cleverest greys — a soft grey with a whisper of green that shifts beautifully through the day. Get the supporting cast right and it sings; get it wrong and it either flattens or turns muddy.
Woodwork first. Don't reach for a brilliant white — it flattens Gray Owl and steals its subtlety. And avoid a creamy or off-white too, because that warmth drags the green undertone forward in an uncomfortable way. The sweet spot is a clean, very slightly warm white. Farrow & Ball All White (LRV 92) is a cracking choice here — it's about as pure and uncomplicated as white gets, so it lets Gray Owl do the talking without fighting it.
Accents. Go cool, not warm. Charcoal and soft black are your friends, not browns or tans. Paint & Paper Library Blue Blood (LRV 16.4) is a beautifully deep, inky navy with a cool green-grey undertone that grounds the scheme — perfect on a feature wall, joinery or a door. It picks up the cool side of Gray Owl rather than working against it.
If you want a bit of life, break the cool logic deliberately rather than by accident. Mylands Beehive Place No.140 (LRV 58.6) is a golden, honeyed yellow — against a cool grey it works precisely because it's one intentional, contained note of warmth (the back of shelving, a connecting loo), not warmth scattered through the scheme. Dulux Fuchsia Falls 2 (LRV 29.8) is the bolder play — a bright, cool magenta-pink for cushions, a single chair, or a door if you're feeling brave.
The metals matter. Stick to cool metals throughout — brushed nickel, chrome, polished steel. Brass and warm bronze will pull against the green undertone and make the whole room feel slightly off.
Practical tip: paint a big board, at least A2, and stand it against your existing flooring and fabrics before committing. Gray Owl is a north-light-friendly grey but it does drift, so look at it morning and evening before you order the lot.