And here's exactly how I made it.
I started with a piece of old wood wall paneling left over from my kitchen renovation. I cut it to the size I wanted and painted one coat of primer all over the wood. When it was dry, I lightly sanded it to make it look older.
I used regular printer paper and printed a mirror image of the words that I wanted on my sign. I just used the "mirror image" option on my printer settings. Here's what it looks like:
Next I decided on the placement of the words and put the paper ink-side down. I used painter's tape to hold it in place. Next I dipped a Q-tip in water and rubbed it along the letters.