Start with a branch and whittle the top flat. Carve or use your saw to put a triangular recession along the length into the middle. Round the edges again.
This is how the top looked like after carving the triangular recession.
Do a bit of refining the edges, and there you have it. Good for decorating gift boxes or for leaving them in the woods for others to find and hopefully enjoy. I like to do that these days to spread some joy and portray that not all knives are evil.
Have fun and take care!