Flames on screens. Projecting images of various types of flames onto  LCD/TFT screens would seem the most immediate and simplest solution  to implement, in order to have  decorative flames. On the internet, you can easily find video images that can last for hours and that can be downloaded and shown on your own TV.  Obviously, this solution does not offer the three-dimensionality of fire and, therefore, is not sufficiently realistic.

Electric Lava
Led Flames
Water Electric Flames
Lcd/Tft Flames
Holographic Flames Effect
Bioethanol Flames
Gas Flames
Wood Flames