I wanted to make a sign, so I painted the whole thing, not just the frame. I used white homemade chalk paint. The Plaster of Paris helps the paint adhere well even to the glass. Two coats did the job.
I distressed the sign (did I mention that I lettered onto the glass the words Give thanks). I distressed the paper heavily using coarse sand paper. Frequently sanding right through the paper, giving the look age would produce.