The thing to understand about Night Fishing is that it isn't a true blue — there's a real violet thread running through it. That changes everything. Pair it with crisp Scandinavian blues and it can tip cold and a bit funereal. Lean into the violet instead and it comes alive.
The smart move is to bring warmth in to balance the cool. Copper Glow from Dulux (LRV 30.1) is a cracking accent — a warm, burnished terracotta-copper that picks up the violet and turns it romantic rather than gloomy. Use it on a single piece of joinery, a chimney breast or in soft furnishings. Dusty pinks and warm plaster tones do the same job if copper feels too bold.
For depth and grounding, Mylands Cigar BH.20 (LRV 11.8) is your friend. It's a rich oxblood-brown that sits gorgeously against Night Fishing — think a dark, moody scheme where the two deep tones hold hands. Lovely on a feature wall opposite the Night Fishing or as a panelled lower half.
Now the trim. Don't reach for brilliant white — it'll fight. Go soft and warm. Paint & Paper Library Sand I (LRV 95.4) is a beautifully gentle off-white that keeps the scheme calm. If you want something a touch cleaner but still warm, Farrow & Ball All White (LRV 92) does the trick without going stark.
For the finishing touches: champagne brass and walnut are the metals and woods that warm Night Fishing rather than chill it. Aged brass handles, a walnut sideboard, antique gold picture frames — all of it pulls the violet towards plummy and inviting.
Practical advice: test Night Fishing in your actual room before committing. In a north-facing space it'll read deeper and cooler, so the warm accents matter even more. Paint big A2 boards, move them around through the day, and only then settle on how much Cigar and Copper Glow you want to bring in.