An animatd shader with two bitmaps for Diffuse and Bump.
The lumination is created with a Ramp passing thru the bump bitmap. The animation is created by translating a 3D Noise node. It currently does not loop, but could easily be made to by yourself. The animation is currently 60 frames, but can easily be changed to any length by you.

This shader was designed to be used under/behind smoke and flame.