I had fun with my stamp carving, but was not happy with the postcards, so I have come up with something I like better. The colours are Sepia and Ultramarine. I realized that sepia was the colour of old photos, not "brown". So I went to my Altered Pages cache and found some sepia images I really liked!
Not sure what I'm going to do with the old postcards yet. I'll save them, and someday they will be "Just the thing I needed!" for a future project!