Solid Noise Filter
Procedural noise textures, such as this Perlin noise filter, produce visually appealing, random patterns which are often applied as realistic bump-maps or for landscape generation, clouds, lightning, grunge, and others effects which are limited only by the artist's imagination and skill.
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The included Difference filters are installed using the free Adobe Extension Manager® CS6. After installing it and the Solid Noise filters, restart Photoshop and they should be found in the Filter → Render sub-menu.
Unless otherwise stated, all content and images are copyright © 2013 Peter Ronhovde
Images of the Sun are from NASA archives.