Use a monochromatic color scheme on your furniture, walls and rugs. Select different shades and textures of color.
To get the illusion of a larger room, use a color scheme that is light rather than bright or dark. Pastels, neutrals and white are all good color possibilities.
The floor and the ceiling are the fifth and sixth walls of every room. A light-colored flooring such as light oak or a light-colored carpet will make the room appear brighter and more open. The same applies to the ceiling—use a light color or white to "open up" the space above.
Lighting is one of the key elements in enlarging a small space. Recessed spot lighting is visually appealing and is perfect for a small space. A torchiere light is great for bouncing light off of the ceiling and back down on the room.
Limit the number of accessories to avoid the cluttered feeling. Use the “minimalism” way in decorating.
Adding a wall mirrors, increases the appearance of the size of the room tremendously. They not only reflect images, they reflect light and color. Be a little daring! Use mirror tiles to mirror an entire wall. Your room will appear to double in size.
Don't place too many pieces of furniture in a small space. A love seat may work better than a full-size sofa depending on the size and shape of the room. Add two medium-sized chairs or two small wood chairs instead of a huge sofa chair. Place the chairs closer to the wall and then pull them into the area when additional seating is needed.
A glass table, whether it is a dining, coffee or end table, will keep the appearance of an open and free space. A wooden table would just cut the space by hiding some floor.
Add paintings or prints to the walls. One large painting works better than a group of small paintings. Try to keep simple, yet classy!