Most gas fireplaces can't exactly trick you into thinking that you into thinking that you've got a roaring real wood fire, but going by the video, it looks like this very cool model using water vapor and LEDs does an amazingly convincing job.

The Zen Fireplace from GlammFire doesn't generate any smoke or heat, so you won't get busted if you want a little ambiance and your town has banned real fireplaces to preserve air quality. Okay, so you don't get the cozy warmth of an actual fireplace, but I guess you could just crank up the heat.

GlammFire, via Born Rich