Paint the walls of the living room and foyer in the same color. This creates one continuous space between the two rooms. The flooring material of both spaces should likewise be the same, whether carpet or hardwood. Alternatively, you may choose to paint the walls of the foyer slightly darker than the walls of the living room to create the sense of "opening up" in the larger of the two rooms, the living room.
Remove clutter from both rooms. This is important both psychologically and physically. Cluttered rooms have more potential for accidents, so by removing clutter you make crowded rooms easier to navigate. Keep out any stacks of magazines, unnecessary boxes, mail, toys and other objects that don't belong in these spaces.
Keep your decor simple, using fewer, more high-impact decorative pieces rather than a higher number of smaller decorative pieces. Keep the knick-knacks to a minimum.
Use coordinating wall decor in both rooms to create the sense of an open, continuous space. For example, place a few large, bold paintings in the living room and a few smaller paintings in the foyer. All paintings should use similar colors or have a similar theme or painting style. Alternatively, you may choose black and white photography to decorate the walls of both rooms. Use the same style of picture frame for all photographs. Personalize your decor by taking the photographs yourself.
Allow as much natural light as you possibly can into both spaces. If possible, choose a front door with a very large window. Curtains in these rooms should not block light but filter it, so that both rooms are as bright as possible.
Remove any doors separating the two spaces. Take off the hinges and spackle and paint over any holes from the old door.
Invest in light fixtures and lamps. Instead of one or two large lamps to light the entire space of both rooms, purchase many smaller lamps. This will make both spaces feel more intimate at night, creating a sense that each space is more complex and multifaceted than it first appears.