Leave the living room feature wall blank if you like cautious rooms. This one is built from hard-edged blocks of bright pink, orange, yellow and lilac, cut through with deep teal, and it sets the tone the moment you walk in. A grey sofa stops looking like a compromise. Pale walls read as deliberate rather than unfinished. Hang it above a low sideboard or a desk, at eye level, so the vertical stack has room to rise. Keep the furniture plain and the textures simple: flat weaves, smooth wood, one or two solid-colour cushions picked from the print. What not to do: crowd it with patterned wallpaper, busy rugs or a row of small framed pieces. It needs clear wall on both sides. As a canvas the surface softens the colour very slightly and the wrapped edges carry the blocks round the sides.