I found this clipart online and decided to turn it into simple moon phase mini cards.
You can print the labeled set or a wordless set on to white card stock. You can either leave the backs white or run them through the printer again to make them have grey or black backs. You can laminate them and then cut out. These will fit nicely in a 2.45″ x 3.9″ by rectangular tin.
The cover image you can print in plain white paper and use rubber cement, white school glue, or tacky glue to attach to the tin.