Test it this way: if the nursery feels safe, size up. This is a warm, gently silly room picture rather than a quiet one, and it wants room to move. The mustard and cream horse throws light back into a space, so a plain wall above a cot, changing table or low shelf stops looking like leftover space and starts looking planned. Keep the rest simple: pale wood, cream linen, one woven basket, a lamp with a warm bulb. Sage or soft clay walls suit it. Skip busy patterned wallpaper behind it, and don’t crowd it with bright plastic storage the colours start arguing. As a canvas the frameless edge keeps it relaxed and easy in a child’s room.