The best way I'd do this is by mixing different noise textures with a Mix RGB node, and using a high contrast noise texture as the fac of the mix RGB node. I'd the add a color ramp at the end to get the colors you want.
The image below is a simple node setup mixing the two noise textures with a high contrast noise texture fac.
The image below is a bit more complicated, but is creates more detail in the texture, and more can be changed and customized.
This final one is to show how much you can do to modify the texture to your needs.
There is no specific hack to making certain textures. It is mostly just using what you have properly to make what you want. I hope I helped. If you have any questions let me know.