How to make an antique sign. After painting the sign (full tutorial included), use a soft cloth to apply a dark brown furniture wax in a thin layer to entire surface of sign. The wax will settle in the imperfections in the wood, giving the sign an authentically aged look. Allow wax to dry for 3-5 minutes, then buff to a shine with a clean cloth.
To print on a paper bag, invert the image (across horizon), click on "Custom" and enter the dimensions (5.2x10.2). Rename the custom print, "paper bag". Hit OK and you're all set. Next time, you'll just have to go to paper size and select "paper bag".