Cinematic look with a fog machine or hazer
If you want to up your video production game, consider experimenting with a fog machine. If you want to up it even more, consider experimenting with a hazer; the fog machine's refined big brother.
Technically, you use the machines to spray oil or water based smoke or "fog" on set before recording. You can be subtle or "Jurassic Park hard-core" about it. It all depends on the atmosphere and look you're after for your story.
If you want to learn more about using fog in your vidoes, check out Film Riot's; Cinematography with Fog! The video starts out with a subtle example, and ends with a pretty "foggy" one. It's great for seeing the whole spectrum.
If you're not sure if you want to invest in a machine for your video effects toolbox, why not just rent one to begin with? Cheap. Fun. No strings attached.