I made this for my wife, lover of the tree of life and the moon.
Step 1: Picture
First, find a drawing that you like and print it out as large as you want
Step 2: Outline
Next use a razor to outline the drawing into the wood
Step 3: Burn
After the drawing is outlined by a razor I used a router to define the outline. Once it is as deep as you want take a soldering pen and burn your design into the wood!