Flame texture loosely resembles flames rising in the Y axis.

Parameters :

Position : Position of the texture.

Scale : The texture is scaled by this value.  Use these parameters to scale or stretch the texture in one or more directions.
 
Range : This is the range in the Y axis from where the flames start to where they disappear into the background.

Noise : Noise applied to the flames.  Higher values for Noise distort the flames more and more.

Meander : This is a second noise that is applied to the flames.  This is designed to push and pull the flames on a larger scale.  Used with Meander Size to produce effect.

Meander Size : This is the scale of the Meander.  Larger values here cause the effect to be applied to the flames on a larger scale or area.

Notes : Low value for Noise works best to get something like flames.  Higher values here produce an interesting and unrecognizable pattern.