Floor to ceiling drapery is one of the most effective ways to make a space look like it has higher ceilings. If you install your drapery close to ceiling, it will trick you eye into looking up.
Tip 2 - Paint
Paint your walls in light colors. This will help with reflecting light in a space, making the room look larger
Tip 3 - Stripes!
Just like hanging your drapery close to the ceiling, stripped walls will fool your eye into thinking the room is taller.
Tip 4 - Scale and Proportion.
Make sure to buy furniture that fits the space. If you have a small bedroom and a large clunky wood bed frame, odds are, it's not going to look good. Instead, replace it with a wall hung tufted piece that will shave off a few extra inches.
Tip 5 - No Clutter.
It's always hard to edit, but it is so important in a small space. To keep an open feel, choose a few cherished items to display and ditch the unnecessary knick-knacks.