These are washing boards. Rosa Hubermann washed clothes & cleaned for a living. (She also made pea soup on the side.) She was later fired because of the economic issues going on.
Idea: A quaint old adage in fancy-schmancy script. Could do other language(s) with English translation on bottom of cup, or on the part of saucer covered by cup. A variety of sizes & shapes would become a 'matched set' if all were painted same color. [ Rosa]