Dramatic Pose! Tutorial for PSP7, and easily translatable to PS.
This tutorial is designed specifically for silhouette images. While the effect may also work on an image that doesn't fit that criteria, I've personally never tried to do it. Anyway..
1. Start with your original image, then resize to 100x100 pixels.
At this point, I also added a 1px black border on a separate layer using the line tool, set to 12% opacity. (This can easily be done last instead, but I wanted the outline of the icon to show in the rest of the images.)
2. Paste this texture by
colormered_cons as a new layer, with its blend mode set to "Hue" at 100% opacity.
3. Another texture by
colormered_cons, and this time I deformed it thoroughly (pictured as the second image). In addition to playing around with the size, I mirrored it, and went over the the yellow lights with the Soften brush.
Paste the texture as a new layer, set to "Overlay" at 100% opacity.
4. Light texture by
teh_indy, with my deformation pictured to its right. Note that when I converted the texture to grey scale, I then had to increase its color depth again (Colors -> Increase Color Depth -> 16 Million Colors) before I put it on the icon.
Paste the texture as a new layer, set to "Screen" at 100% opacity.
5. Paste this image (originally a brush from
innocenceagain) as a new layer, set to "Overlay" at 100% opacity.
6. Lastly, after another personalized deformation, paste this texture as a new layer, set to "Screen" at 100% opacity.
(If anyone knows who made the texture, please comment. Credit is due to someone, surely.)
Good luck with your icons!