Creating the Initial Gradient|
Initially, create a new gradient with plenty of knots. Then simply capture the gradient from an image. Remember, you can view how the captured gradient looks using one of the in-built texture generators. The two handles for the gradient sample in the image window can be adjusted with instant feedback allowing the gradient capture to be fine-tuned. Of coarse, you can always just load a gradient from any Lightwave object, preset or surface file or simply make one up.
Import the Gradient into Photoshop|
Then simply export the resultant gradient as a Photoshop gradient and load it directly into Photoshop.
Then Just use the Gradient|
The imported gradient can be used just like any other gradient for all types if fills.
Or Make Textures|
Alternatively, simply use the Gradient Creator's built in texture engine to make your own patterns.