I was passing by a yard in Pennsylvania with a newly cut tree, and I told them what I did, and they were nice enough to let me have a few large chunks.
I had always fractal burned only flat pieces up to this point, but I figured why not burn 3 dimensional chunks of wood? My husband cut them into smaller chunks for me. The best part about these pieces were the saw marks and unevenness, which I didn’t attempt to “fix”.
Below are the results!