Pine is a lightweight, inexpensive wood that can be stained to look like more expensive species. If you’re planning on staining pine, specify “clear” or “stain-grade” pine—wood without knots that stains more uniformly. If you’ll be painting the trim, specify “paint-grade” moldings—they’re less expensive and may contain joints or knots that would stand out if stained but disappear when painted. Poplar is also an inexpensive wood that machines smoothly but lacks pine’s attractive grain; it is generally painted. Oak is a dense, heavily grained hardwood that’s more expensive than the previous options; it’s a premium choice for naturally finished woodwork. It is often covered with a clear finish, and it may be stained as well. This living room is trimmed in varnished oak for a warm, elegant look. Here, narrow bands of black-painted trim echo the room’s rectangular lines and prominent built-ins. Look around your contemporary home for opportunities to use a contrasting trim color to your advantage. Here, columns and false ceiling beams define a kitchen area. In the adjoining living room, a cozy seating arrangement indicates that you’ve entered a more formal living space.