Start with a 400x150 canvas with a black background.
1) Put a lens flare on either side of the thingy
http://img221.echo.cx/img221/508/lensflares4he.jpg
2) Filter > Sketch > Chrome with Detail 7 and Smoothness 1
http://img221.echo.cx/img221/8931/chromes4us.jpg
3) Filter > Render > Difference Clouds and Ctrl+F until you get something like this:
http://img221.echo.cx/img221/82/diffclouds6hr.jpg
4) Ctrl+B with settings:
Midtones: Cyan 88, yellow -31
Shadows: Red 56, yellow -62
Highlights: Yellow -76
http://img221.echo.cx/img221/9284/ctrlb5ly.jpg
5) Make a new layer filled with #00FF00 (green), and set it to Multiply, with 60% opacity.
http://img221.echo.cx/img221/2285/grlayer2gb.jpg
6) Filter > Texture > Patchwork with settings Square size 8 Relief 4
http://img221.echo.cx/img221/9503/pwork7ta.jpg
7) Make a new layer with default colour still green. Filter > Render > Clouds and set the layer to Soft Light
http://img221.echo.cx/img221/851/slight7ih.jpg
8) Use the gradient tool (Difference; Black, White; with Dither checked) and go right to left (or left to right, if you prefer) and then Filter > Blur > Gaussian blur with Radial Pixel 3.0
Your final result should look like this:
http://img221.echo.cx/img221/2963/grnfog5xm.jpg
Another example is my old sig, which I'll put up later...
