Step 12 Moving to the Speckle 1 layer, soften it. Step 13 Make only the White Base and Speckle 2 layers to be visible. Choose a 100 x 100 selection in the middle of the image, and make a seamless tile from it. Step 14 Repeat Step 13 for other combinations of layers. Using Black Base and Speckle 1 is effective, as are the two speckled layers on top of the white base.
Options Try bases of different colors before applying random noise.
Use more or less random noise. Vary the tolerance level for the Make Transparent modification. Use different colors combinations when changing the hue map. Gaussian blur by a different radius. Use Soften More, or another blurring option.