Mallow White is one of those genuinely useful neutrals — balanced enough that it doesn't pull hard warm or cold, which means it plays well with almost anything you throw at it. That's exactly why it works as a whole-house colour: you can run it through hallway, landing and bedrooms, then change the mood room to room with your accent choices.
For a calm, grounded scheme, pair it with a soft sage. Mylands Artichoke BH.13 (LRV 27.6) is a lovely muted green that brings just enough depth to anchor the lighter walls without going gloomy — gorgeous on a chimney breast or joinery against Mallow White elsewhere.
If you want something cooler and more architectural, Paint & Paper Library Slate IV (LRV 67.5) is a soft, airy grey-blue that keeps things light and gentle. At that LRV it stays bright, so it's a safe partner in north-facing rooms where you don't want to lose the light.
For proper drama — a study, a feature wall, or panelling below a dado — reach for Dulux Sapphire Springs 1 (LRV 6.4). That's a deep, inky near-blue that throws Mallow White into relief and makes the whole scheme feel considered rather than accidental. The big LRV gap between the two does the heavy lifting.
The "but what about" bit: because Mallow White is so accommodating, the danger is a scheme that feels a touch flat — too many soft tones with nothing to push against. Always give it one moment of contrast, whether that's a darker green, a saturated blue, or a warm timber floor. That one note of depth is what makes the neutral read as deliberate.
Practical advice: test all your pairings on the same wall as the Mallow White, and look at them morning and evening. Sage and soft blue in particular shift with the light, so what looks restful at 10am can feel cold by dusk. Two coats on a decent-sized patch, lived with for a couple of days, will tell you everything you need to know.