I already posted this on the official forum, but since it will soon be pushed down to the second page I thought I'd post it here.
This tutorial will teach you to make an explosion like this one.
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1} New image 800x600
2} Clouds- default settings
3} Duplicate layer
4} Top layer - Effects - Distort - Bulge +100
5} Bottom layer - Effects - Distort - Bulge -200
6} Top layer - Blend Mode - Xor
You should have this:
7} Flatten
8} Duplicate layer
9} Top Layer - Zoom Blur 75
10} Top Layer - Blend Mode - Lighten
11} Top Layer - Curves - RGB
You should have this now:
12} Duplicate the top layer
13} Top Layer -
Dents - Scale = 36 (All other settings default)
14} Top Layer - Gaussian Blur = 12
15} Bottom layer - Curves - Luminosity
16} Bottom layer -
Lens - Default
17} Bottom layer - Layers - Rotate/Zoom - Zoom = 0.65x
18} Bottom layer - Curves - RGB
19} Add New Layer
20} Top Layer - Radial Gradient (middle at 400,300)
21} Top Layer - Blend Mode - Additive
22} Flatten and done!
This is only my 2nd tutorial, So constructive criticism and praise welcome. And don't forget to
Post Your Images! 
Ben_R_R
