Start with the color scheme
When you start with a color scheme you narrow down the choices of furniture and the style. This makes things a lot easier.
Fake height with low furniture
Make a space feel instantly more open and large by making the furniture low to the ground compared to the ceiling.
Mirrors are your best friend
Mirrors can be used in so many creative ways and they always make a space feel more open. They go with any style from modern to traditional.
use silver and gold
Metallic finishes already add a lot of sparkle. but silver and gold usually go with most designs and they give you the sparkle without being too gaudy.