Pampas by COAT is a warm, enveloping neutral, and the trick with colours like this is to treat it as the backdrop and let everything else sit in the same warm camp. Get that right and the whole room feels gathered and calm; get it wrong and Pampas looks tired against the harshness.
Start with the woodwork. Either carry Pampas straight onto your trim, or pick a related warm white. The thing to avoid — and I mean really avoid — is pairing it with a pure brilliant white skirting. The cold blue undertone in brilliant white will drain Pampas of all its warmth and leave it looking faintly grubby. Warm white or self-coloured trim every time.
For layering, you've got three directions that all work beautifully.
For a deeper stone tone that adds quiet depth without contrast, Paint & Paper Library Slate IV (LRV 67.5) is a lovely soft mid-tone — light enough to feel airy, grounded enough to stop the scheme floating off.
For a mossy green accent — joinery, a panelled wall, a chimney breast — Mylands Artichoke BH.13 (LRV 27.6) is cracking with Pampas. That earthy, slightly grey-green reads as natural rather than loud, which is exactly what a warm neutral wants beside it.
And if you want a proper deep anchor — a navy-ish moment on a feature wall or in joinery — Dulux Sapphire Springs 1 (LRV 6.4) gives you that dramatic dark without going cold and clinical. It pulls the warm tones forward by contrast.
Don't forget dusty pinks in the soft furnishings either — Pampas loves a faded rose in cushions or curtains.
Practical advice: sample big, and look at all three together at once. Pampas shifts noticeably between north and south light, so test the green and the deep navy on the actual walls before you commit. Two coats on lining paper or A2 boards, moved round the room across a full day, will sort you.