This effect will make a nice explosion. Perfect for those "clashing" banners.
1. Start a new image. I used 640x480 and then cropped the final result.
2. Color the image in black.
3. Make a new layer. Change the foreground color to white.
4. On the new layer, select a custom shape with a lot of edges. Be sure that the shape is set to Fill Pixels, and make make a cluster of shapes in one area.
5. Edit > Stroke ( Width - 1 Pixel, Color - Color you want, Location - Outside, Blending Mode - Normal, Opacitiy - 100% ). Do that twice.
6. Filter > Blur > Radial Blur ( Amount - 100, Blur Method - Zoom, Quality - Best ).
And there you have it.
Creator B)
That effect looks pretty nice.
It's pretty cool. THis is my 5000th post!
Actually, the same effect was used in this banner:

The green thing to the right.
Creator B)
How about all of you guests not post if all your going to do is insult people? You people aren't any better. Considering that you need to go to a tutorials site to learn how to do photoshop.