If you are looking for an easy way to upgrade a room, your best option might be to start with the moldings. Beef up all the moldings, adding width, depth and height to the trim. Far from closing in a room, the increased framing adds depth to the walls, especially if it is painted the same color as the walls for a unified look.
An interior door is a vital part of a house, and there should be a good amount of thought that goes into choosing one. Style, materials, soundproofing and door swing are just some of the points to consider when sorting through the endless options for interior doors.
Pictured below is a gallery of molding and interior door photos.