Rooms go quieter when navy blue is this sure of itself. One bird, drawn in fine ink lines, standing on a big field of off-white. Put it up and the wall stops feeling like a gap. The pale background bounces light back into the room, while the deep blue gives your eye something firm to land on, so a neutral scheme suddenly has a centre. It earns its place on a hallway wall, in a study above a desk, or between two windows in a living room. Keep the company simple: blue and white ceramics, dark wood, cane, a striped cushion or two. Skip busy florals and heavy patterned wallpaper next to it, and resist crowding the wall with small frames. Printed on premium fine-art paper, so the fine hatching stays sharp.