Rosie Posie is a dusty, chalky pink, and the worst thing you can do is treat it like a feature wall against stark white. That contrast yanks out the candy-pink and kills the lovely greyed warmth Earthborn built into it.
The move here is to drench it — walls, woodwork and ceiling all in Rosie Posie. When the pink wraps the whole room it reads sophisticated rather than nursery, and the dustiness holds. Then you bring in depth through the soft furnishings rather than the paint: deep plums, oxblood reds and chocolate browns on upholstery, rugs and curtains do the heavy lifting.
If you want a paintable partner for that depth, Mylands Cigar BH.20 (LRV 11.8) is the one — a rich, near-brown that grounds the scheme beautifully on a chimney breast, a door, or inside a recessed shelf. It gives the room a spine without fighting the pink.
For a cooler, more unexpected pairing, Paint & Paper Library Slate IV (LRV 67.5) brings a soft grey-blue that sits quietly against the warmth — lovely for a connecting hallway or adjoining room. And if you fancy something fresher, Dulux Almost Pistachio (LRV 80.3) is a gentle green that flatters dusty pink the way old plaster flatters a leaf — that classic pink-and-green pairing, done in muted tones so it never shouts.
The one rule: trim in warm off-whites only. Brilliant white exposes the pink as sweet and synthetic. Reach for something with a touch of warmth and a little body — the dustiness needs a partner that shares its softness.
Practical tip: order samples and paint big A2 boards, then look at them in evening light. Rosie Posie shifts noticeably between bright daylight and lamplight, and a north-facing room will pull it cooler and greyer, which can be gorgeous or a bit muddy depending on what you sit it next to.