For those that want a real flame (opposed to electric), but cannot vent, there is only one option in california, Gelled alcohol. There are both inserts (to go inside of an existing fireplace) as well as a complete fireplace (firebox and mantel).

Here are photos and specs on the inserts.

15 inch or 18 inch log & grate set 
15" W x 12" H x 14" Deep 
OR  18" W x 12" H x 14" Deep

  21 inch log & grate set
21 W x 12 H x 14 Deep

24 inch log & grate set
24 W x 12 H x 14 Deep

Video of fire (click to download)