There are dozens of filters which ship with Adobe Photoshop. Some of these are purely functional, in the sense that they sharpen images or remove noise. Others are more aesthetic. We explore  both types in our Photoshop courses. 
In this example of a mockup for a web banner, the basic Clouds filter was used from the Render subset in the Filters drop-down menu. A new layer was then superimposed with a red to black radial gradient and a blending mode of Multiply.
A new layer was then put on top and filled with black. Then Filter > Render > Lens Flare > 105mm Prime. The blending mode was set to Lighten. Another new layer was added and filled with red. The blending mode of this layer was set to Color Burn.
Lastly a new image was sourced and copied on top. The blending mode was set to Multiply. Finally some text was added with a blending mode of Overlay. The file was saved as Working Copy, and then Save As: Jpeg which automatically flattens the layers. A final tonal adjustment can be done in Image > Adjustments > Levels.
Many more tips and techniques can be found at the Adobe website. See many examples of our clients’ work on our Facebook page.
Other related Photoshop Blog Posts:

• Photoshop interface
  
• Photoshop for fashion
• Photoshop deep etching
• Photoshop animated gif
• Photoshop actions