I have worked on the wood material for the Log house I have, making it look realistic and add the colors I would like. I found a great tutorial on youtube. That helped me make the wood and here you can see how to make it from scratch. He did a great job with using a Base material before he made the output nodes
I like how easy it made the nodes at the end.
pixelfondue, 2017. Creating procedural wood in Substance Designer. – YouTube. Available at: https://www.youtube.com/watch?v=M5HZHA89teI [Accessed March 23, 2018].