the image does not do it justice
see here for the shader toy version: https://www.shadertoy.com/view/7dGfWK
Notes on 2016-04-08 Found a new site and have added more examples :) http://thebookofshaders.com
More notes on 2014-07-17 Found this http://www.opengl.org/wiki/Built-in_Variable_(GLSL) And this article http://weworkweplay.com/play/introduction-to-glsl-and-fragment-pixel-shaders/ Which lead me to do shader1 The cool thing about shader1 is that it takes a vec2d mouse input parameter in the shader!
The other day I read this article http://blogs.love2d.org/content/beginners-guide-shaders and my mind was blown.
Here are some shaders that I found and translated to lua/love.
I am absolutely not the author of these shaders I just changed them enough to get them to work in lua. Complete and total props back to the original authors.
The site I used to find shaders is shadertoy https://www.shadertoy.com/
Amazing work is done there.
I tried to leave some comments in the files.
Very cool that love/lua even exists. Check it out here https://love2d.org/
To use any of these shaders you need love version 0.9.1 (the newest as of 2014/07/01). Get love installed then you can clone this repo and just run love on each of the directories. The shaders are really mind blowing to me. Cool stuff.
Here is a screenshot of what the flame shader looks like:
And then one from the shader fire too 
tony