I painted a gray base of paint on the size board I wanted:
Let it dry. Then I painted brown over the gray:
Let that dry too. Then I sanded the brown with sandpaper, so that the grey showed up in a "rustic" way:
And finally, I traced over the letters I printed out from Microsoft word with a ballpoint pen. Then I painted in the letter outlines I could see in the wood.
And I displayed it with pride! My initial plan was to nail coat hangers at the bottom of the board. But since we don't want to make such permanent holes in the wall of our rental apartment, that step is on standby for a while...