You can set parameters of the multicolor texture and add this to the ToolPalette in your personal gallery.

In the ToolPalette, click the category of texture you are interested in, then click one of the texture icons to the right.

Now, click the Parameters button on the ToolPalette.

In the Parameters dialog box, use the slider bars to adjust the parameters. You can also modify the texture colors and the relief effect.

You can also click to Randomize in the menu to modify the gradient.

The Randomize Gradient dialog box you allow to modify the texture color very easily. When you are satisfied by the result, click the OK button.

Now, click to Generate button. You can also save this texture setting in the ToolPalette for future use by clicking the Add button.