It ended up being a kind of a choose-your-own-adventure affair, but luckily my board had a built-in tree trunk once I rotated it, so I leaned into that for the design. The trunk is oil-based wood stain, and the words are wood-burned. It’s hard to tell from the photos, but some parts I also went over with a Dremel.
Thanks, everyone! The teacher was also really tickled I was using the wood’s features that way. I was mostly relieved it was there, because I didn’t really have any ideas and most of the supplies were outside my usual wheelhouse. It gave me a starting point to work from.