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The even layer has a horizontal offset of 0.5, to get the effect of shifted boards. Then we add a new Random Uvs. We select the texture map, and on that Texture Picker we select the wood texture from our drive, and we set repetition to 1/8, offset to 0.5 and rotation to 355. With this, we are only using a portion of the texture, and we translate the part we use. We do this because the texture is not seamless, and we don't want the border to show in the image.
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The random values are 0,5 for translation and 10º for rotation. “Randomize tiles” tiles” box has to be checked in this case.
Then we add a new Random Color texture to the stack, we need to set a blending factor to 50, so both textures are blended with the same influence. We set HSV values to have some difference in each wood sample. Randomize tiles box has to be checked here too.
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Combining Random UVs and Random Color procedurals (click to enlarge).
Here is the resulting .mxm material:
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