Hilary Rhodes provided this neat little graphic display on combining textural components. Here's Hilary's commentary.
Two components, each having a noise frequency of about 50 with sine noise. The output is colour-normale, and has a spline colour setting, with no filter. The second component differs in that the xy angle is 90, thus allowing the lines to cross each other, and the phase amplitude of the second is 309 which is about double that of the first.
As you can see, they are both rather simple, color, one-dimensional Sine noise with a dash of Phase noise thrown in to deform the first noise (If you're lost already better go back to the Rug Example and work through it first). The combination of components 1 and 2 produced a final component to which I gave a colour output with linear interpolation 2 - this gave a somewhat softer effect. I have done this so you can see a gentle undulation in both an x and y direction, and as the stripes criss cross, the change in the colours is seen.
What these squares show are the differences in choosing different colour component interactions. I have changed only the interaction of component one, and the effects can be seen in each successive square. Note that using these effects is like using the calculate commands in Photoshop; Add, Subtract, Combine, etc. As you can now see, the possibilities are frighteningly infinite.
Here are the various combinations: