Open the curtains at mid-morning; the dark green will handle the drama. This is a big, leafy piece with soft lilac and pale sage cut through it, so a plain wall stops looking flat the moment it goes up. Because it is portrait, it suits the narrow wall between two windows, above a low sideboard, or on the run of wall beside a bed. Keep the furnishings simple: pale wood, linen, cane, a couple of green or soft pink ceramics. Real plants nearby echo the leaf shapes without competing. What to avoid is doubling up on pattern busy florals, striped wallpaper or heavily patterned curtains will fight the collage and both will lose. On paper the pale lilac blocks keep their chalky, painted look.